ELA
|
|
- Vernon Webb
- 5 years ago
- Views:
Transcription
1 REPRESENTATONS FOR THE DRAZN NVERSE OF BOUNDED OPERATORS ON BANACH SPACE DRAGANA S. CVETKOVĆ-LĆ AND MN WE Abstract. n this paper a representation is given for the Drazin inverse of a 2 2operator matrix extending to Banach spaces results of Hartwig Li and Wei SAM J. Matrix Anal. Appl pp Also formulae are derived for the Drazin inverse of an operator matrix M under some new conditions. Key words. Operator matrix Drazin inverse D-invertibility GD-invertibility. AMS subject classifications. 47A52 47A62 5A24.. ntroduction. Throughout this paper X and are Banach spaces over the same field. We denote the set of all bounded linear operators from X into by BX and by BX whenx =. ForA BX let RA N A σa andra bethe range the null space the spectrum and the spectral radius of A respectively. By X we denote the identity operator on X. n 958 Drazin 6 introduced a pseudoinverse in associative rings and semigroups that now carries his name. When A is an algebra and a Athenb Ais the Drazin inverse of a if. ab = ba b = bab and a ba A nil A nil is the set of all nilpotent elements of algebra A. Caradus 5 King 23 and Lay 25 investigated the Drazin inverse in the setting of bounded linear operators on complex Banach spaces. Caradus 5 proved that a bounded linear operator T on a complex Banach space has the Drazin inverse if and Received by the editors September Accepted for publication October Handling Editor: Bit-Shun Tam. Department of Mathematics Faculty of Sciences and Mathematics University of Niš P.O. Box 224 Višegradska 33 8 Niš Serbia dragana@pmf.ni.ac.rs. Supported by Grant No. 443 of the Ministry of Science Technology and Development Republic of Serbia. nstitute of Mathematics School of Mathematical Science Fudan University Shanghai 2433 P. R. of China and Key Laboratory of Nonlinear Science Fudan University Education of Ministry ymwei@fudan.edu.cn. Supported by the National Natural Science Foundation of China under grant 875 Shanghai Municipal Education Commission Dawn Project and Shanghai Municipal Science and Technology Committee under grant 9DZ22729 and KLMM9. 63
2 64 D. Cvetković-lić and.wei only if is a pole of the resolvent λ T of T. The order of the pole is equal to the Drazin index of T which we shall denote by inda ori A. n this case we say that A is D-invertible. f inda =k then Drazin inverse of A denoted by A D satisfies.2 A k+ A D = A k A D AA D = A D AA D = A D A and k is the smallest integer such that.2 is satisfied. f inda then A D is known as the group inverse of A denoted by A. A is invertible if and only if inda = and in this case A D = A. Harte 2 and Koliha 24 observed that in Banach algebra it is more natural to replace the nilpotent element in. by a quasinilpotent element. n the case when a ba in. is allowed to be quasinilpotent we call b the generalized Drazin inverse g-drazin inverse of a and say that a is GD-invertible. g-drazin inverse was introduced in the paper of Koliha 24 and it has many applications in a number of areas. Harte 2 associated with each quasipolar operator T an operator T whichis an equivalent to the generalized Drazin inverse. Nashed and Zhao 29 investigated the Drazin inverse for closed linear operators and applied it to singular evolution equations and partial differential operators. Drazin 7 investigated extremal definitions of generalized inverses that give a generalization of the original Drazin inverse. Finding an explicit representation for the Drazin inverse of a general 2 2block matrix posed by Campbell in 4 appears to be difficult. This problem was investigated in many papers see n this paper we give a representation for the Drazin inverse of a 2 2 bounded operator matrix. We show that the results given by Hartwig Li and Wei 22 are preserved when passing from matrices to bounded linear operators on a Banach space. Also we derive formulae for the Drazin inverse of an operator matrix M under some new conditions. f/ accσa then the function z fz can be defined as fz =ina neighborhood of and fz =/z in a neighborhood of σa\{}. Function z fz is regular in a neighborhood of σa and the generalized Drazin inverse of A is defined using the functional calculus as A d = fa. An operator A BX is GD-invertible if / accσa and in this case the spectral idempotent P of A corresponding to {} is given by P = AA d see the well-known Koliha s paper 24. f A is GD-invertible then the resolvent function z z A is defined in a punctured neighborhood of {} and the generalized Drazin inverse of A is the operator A d such that A d AA d = A d AA d = A d A and A AA d is quasinilpotent. t is well-known that if A BX is GD-invertible then using the following
3 Drazin nverse of Bounded Operators on Banach Space 65 decomposition we have that A A = : A 2 X = A : NP is invertible and A 2 : is quasinilpotent operator. n this case the generalized Drazin inverse of A has the following matrix decomposition: A A d = :. For other important properties of Drazin inverses see Main results. Firstly we will state a very useful result concerning the additive properties of Drazin inverses which is the main result proved in 6 with a π = aa d. Theorem 2.. Let a b be GD-invertible elements of algebra A such that Then a + b is GD-invertible and a π b = b ab π = a b π aba π =. a + b d = b d + b d n+2 aa + b n a π + b π a d n= n= + b π a + b n ba d n+2 b d n+2 aa + b n ba d n= n= b d aa + b n ba d n+2 b d k+2 aa + b n+k+ ba d n+2. n= k= Next we extend 22 Lemma 2.4 to the linear operator. Lemma 2.2. Let M BX G BX and H B X be operators such that HG = X. f M is GD-invertible operator then the operator GMH is GDinvertible and 2. GMH d = GM d H.
4 66 D. Cvetković-lić and.wei and Proof. tisevidentthat GM d HGMHGM d H=GM d MM d H = GM d H GM d HGMH =GM d MH = GMM d H =GMHGM d H. To prove that GMH GMHGM d H is a quasinilpotent note that GMH GMHGM d H = GM MM d H. Since M MM d is quasinilpotent we have r GMH GMHGM d H = r GM MM d H = lim GM MM d H n n n = lim G M MM d n n H n Hence 2. is valid. lim G n n M MM d n H n =. n From now on we will assume that X and are Banach spaces and Z = X. For A BX B B X C BX andd B consider the operator A B M = BZ. C D Theorem 2.3. f A and D are GD-invertible operators such that BC = and DC = then M is GD-invertible and M d = A d CA d 2 X + D d 2.2 X = XA B D = A d n+2 BD n D π + A π A n BD d n+2 A d BD d n= n= and = CXD d + CA d X.
5 Drazin nverse of Bounded Operators on Banach Space 67 Proof. We rewrite M = P + Q P = 4 Theorem 5. P d is GD-invertible and A P d d X = D d A B D and Q = C. By X = XA B D is defined by 2.2. Also Q is GD-invertible and Q d =. Now we have that the condition P π Q = Q is equivalent to AX + BD d C = D π C = C 2.3 as the condition PQP π = is equivalent to BCA π =DCA π = BCAX + BD d = DCAX + BD d =. 2.4 Since BC =anddc =from2.3 and 2.4 we get that P π Q = Q and PQP π = so by Theorem 2. we have that M is GD-invertible and M d = P d + = = M n QP d n+2 n= A d X D d A d X D d A d = CA d 2 + n A B C D n= + X + D d for = CXD d + CA d X. i= CA d n+2 n+2 CA d i XD d n+2 i i= CA d 2 2 CA d i XD d 2 i Remark. Theorem 2.3 is a strengthening of 4 Theorem 5.3 since it shows that one of the conditions of Theorem 2.3 BD = is actually redundant. Theorem 2.4. f A and D are GD-invertible operators such that 2.5 C AA d B = A AA d B =
6 68 D. Cvetković-lić and.wei and S = D CA d B is nonsingular then M is GD-invertible and ψ " #! ψ " M d AA d B X = + R R + R i+ 2.6 C AA d A i #! 2.7 A d + A d BS CA d A d BS R = S CA d S. Proof. n8itisprovedthatσa σm =σa σd so we conclude that / accσm i.e. M is GD-invertible. Using that X = for P = AA d wehave B = B B 2 Now we have M = : M = 2 = A B A 2 B 2 C C 2 D A B A 2 B 2 C C 2 D A B C D C 2 B 2 A 2 : and C = C C 2 : :. 2 = = : :. Since = 2 using Lemma 2.2 we have that M d = M d 2 so we proceed towards finding the Drazin inverse of M.
7 Drazin nverse of Bounded Operators on Banach Space 69 n order to get an explicit formula for M d we partition M as a 2 2block-matrix i.e. A3 B 3 M = C 3 D 3 A B A 3 = D C B 3 = C 2 C 3 = B 2 D3 = A 2. From 2.5 we get C 2 B 2 =anda 2 B 2 =sob 3 C 3 =andd 3 C 3 =. Alsoby σa 3 σa =σa σd it follows that A 3 is GD-invertible. Applying Theorem 2.3 we get that M d = = A d 3 C 3 A d 3 2 C 3 A d 3 A d 3 A d 3 i+2 B 3 D3 i C 3 A d 3 i+3 B 3 D3 i A d 3 i+ B 3 D3 i For the operator matrix A 3 we have that its upper left block the operator A is nonsingular and its Schur complement SA 3 =D C A B = D CA d B is nonsingular which implies that the operator A 3 is nonsingular and A A + A 3 = B S C A A B S S C A S. Now M d = M d 2 = 3 +. C 3 A d 3 A d A d 3 i+ B 3 D3 i 3 = 4 = : :.
8 62 D. Cvetković-lić and.wei tisobviousthat 4 3 =. Let us denote by R = 3 A d = : 6 = :. Obviously R is given by 2.7. Now M d = Z + 5 C 3 A d 3 4 R Z + 3 A d 3 i+ B 3 D3 i 6. By computation we get that AA 5 C 3 A d d 3 B 4 = R 3 A d 3 i+ B 3 D3 i 6 = 3 A d 3 i 4 3 A d 3B D3 i 6 = R i AA d A i R C AA d = R i+ C AA d A i so 2.6 is valid. Remark 2. Theorem 2.3 generalizes 22 Theorem 3. to the bounded linear operator. Taking conjugate operator of M in Theorem 2.4 we derived the following corollary: Corollary 2.5. f A and D are GD-invertible operators such that C AA d B = C AA d A = and S = D CA d B is nonsingular then M is GD-invertible and M d = + Ai AA d B R i+ R + R C AA d R is defined by 2.7. f an additional condition C AA d A = is satisfied in Theorem 2.4 we get a simpler formula for M d :
9 Drazin nverse of Bounded Operators on Banach Space 62 Corollary 2.6. f A and D are GD-invertible operators such that C AA d B = A AA d B = C AA d A = and S = D CA d B is nonsingular then M is GD-invertible and AA M d d B = + R R + R C AA d R is defined by 2.7. n the paper of Miao 28 a representation of the Drazin inverse of block-matrices M is given under the conditions: C AA D = AA D B = and S = D CA D B =. Hartwig et al. 22 generalized this result in Theorem 4. and gave a representation of the Drazin inverse of block-matrix M under the conditions: C AA D B = A AA D B = and S = D CA D B =. n the following theorem we generalized Theorem 4. from 22 to the linear bounded operator. Theorem 2.7. f A and D are GD-invertible operators such that C AA d B = A AA d B = S = D CA d B = and the operator AW is GD-invertible then M is GD-invertible and 2.8 M d = 2.9 ψ + " AA d B R = # R! R ψ CA d + X R i+ " A dw A d B C AA d A i and A dw =AW d 2 A is the weighted Drazin inverse of A with weight operator W = AA d + A d BCA d. Proof. Using the notations and method from the proof of Theorem 2.4 we have that M d = A d 3 A d 3 i+2 B 3 D3 i C 3 A d 3 2 C 3 A d 3 i+3 B 3 D3 i = C 3 A d 3 A d 3 A d 3 i+ B 3 D3 i. #!
10 622 D. Cvetković-lić and.wei Now prove that the generalized Drazin inverse of A 3 is given by F = C A A H 2 d A A B H = + A B C A. Remark that from the fact that AW is GD-invertible it follows that A H is GD-invertible. By computation we check that A 3 F = FA 3 and FA 3 F = F. To prove that the operator A 3 FA 3 is a quasinilpotent we will use the fact that for bounded operators A and B on Banach spaces rab = rba. First note that A 3 = C A A A B and H = A B C A. Since it follows that A 3 FA 3 = C A A HA H d A A B r A 3 FA 3 = r A HA H d A H = so A 3 FA 3 is a quasinilpotent. Hence A d 3 = F. Now for R = 3 A d 3 4 we get that 2.8 holds. By computation we obtain that R = 3 A d 3 4 = CA d A dw A d B H W = = AA d + A d BCA d. We obtain the following corollary by taking conjugate operator: Corollary 2.8. f A and D are GD-invertible operators such that C AA d B = C AA d A = S = D CA d B = and the operator AW is GD-invertible then M is GD-invertible and A M d i AA d B = + R i+ R + R C AA d R is given by 2.9 in Theorem 2.7. f the condition C AA d A = is added to Theorem 2.7 we have a simpler formula for M d.
11 Drazin nverse of Bounded Operators on Banach Space 623 Corollary 2.9. f A and D are GD-invertible operators such that C AA d B = C AA d B = A AA d B = S = D CA d B = and the operator AW is GD-invertible then M is GD-invertible and M d = AA d B + R is given by 2.9 in Theorem 2.7. R R + R C AA d The next theorem presents new conditions under which we give a representation of M d in terms of the block-operators of M. Theorem 2.. f A and D are GD-invertible operators and 2. AA d B = and C AA d = then M is GD-invertible and M d = R d + CA d + R π R i CA d i+2 A d + R = AA d A B D and R d = AA d A i BD d i+2 D d. Proof. As in the proof of the Theorem 2.4 we conclude that M is GD-invertible. Using that X = for P = AA d wehave B = Now B B 2 M = : A B A 2 B 2 C C 2 D : and C = C C 2 :. M = J 2 MJ A 2 B 2 = C 2 D C : B A
12 624 D. Cvetković-lić and.wei J 2 = :. and J = : Using Lemma 2.2 we deduce that M d = J M dj 2. n order to compute M d it suffices to find the Drazin inverse of M. To derive an explicit formula for M d we partition M as a 2 2 block-matrix i.e. A3 B 3 M = C 3 D 3 Since A2 B 2 A 3 = D C 2 B 3 = C C 3 = B D3 = A. B 3 C 3 = C B = CAA d B = and D 3 C 3 = A B = AA d B =. by 2. we have B 3 C 3 =D 3 C 3 =andb =. Similarly as in the proof of the Theorem 2.4 we conclude that A 3 is GD-invertible operator. Now by Theorem 2.3 M d = Ad 3 A π 3 A i 3B 3 A i+2 A d 3B 3 A A = A d 3 B3 A + A π 3 A i 3B 3 A i+2 + A. By the second condition of 2. we obtain that C 2 = as for the operator A 3 we have that B 2 C 2 = and DC 2 =. Applying Theorem 2.3 to A 3 weget A d 3 = A i 2 B 2D d i+2 D d.
13 Drazin nverse of Bounded Operators on Banach Space 625 Now M d = J M d J 2 = J 3 A d 3 J4 + B 3 A J 5 + J3 A π 3 = R d + J 3 B 3 A J 5 R = J 3 A 3 J 4 J 3 = + R π J 3 J 4 = A A i 3 B 3A d i+2 J 5 + A i 3B 3 A i+2 J 5 + tisevidentthatj 4 J 3 =. By computation we get that J 3 B 3 A J 5 = CA d J 3 A i 3 B 3A i+2 J 5 = R i Also from the definition of R wehavethat R = AA d A B D A d and J 5 =. CA d i+2. and by 4 Theorem 5. R d = AA d A i BD d i+2 D d. 3. Concluding remarks. The whole paper would appear to be valid in general Banach algebras not just algebras of operators. Whenever P = P 2 G for a Banach algebra G there is an induced block structure A M G = N B in which A and B are Banach algebras and M and N are bimodules over A and B.
14 626 D. Cvetković-lić and.wei REFERENCES A. Ben-srael and T.N.E. Greville. Generalized nverses: Theory and Applications Second Edition. Springer New ork R. Bru J. Climent and M. Neumann. On the index of block upper triangular matrices. SAM J. Matrix Anal. Appl. 6: S.L.CampbellandC.D.MeyerJr. Generalized nverses of Linear Transformations. Dov er Publications nc. New ork S. Campbell. The Drazin inverse and systems of second order linear differential equations. Linear Multilinear Algebra 4: S.R. Caradus. Generalized nverses and Operator Theory. Queen s Paper in Pure and Applied Mathematics Queen s University Kingston Ontario N. Castro González and J.J. Koliha. New additive results for the g-drazin inverse. Proc. Roy. Soc. Edinburgh Sect.A 34: N. Castro González and E. Dopazo. Representations of the Drazin inverse for a class of block matrices. Linear Algebra Appl. 4: N. Castro-González E. Dopazo and J. Robles. Formulas for the Drazin inverse of special block matrices. Appl. Math. Comput. 74: N. Castro González J.J. Koliha and V. Rakočević. Continuity and general perturbation of the Drazin inverse of for closed linear operators. Abstr. Appl. Anal. 7: N. Castro González and J.. Vélez-Cerrada. On the perturbation of the group generalized inverse for a class of bounded operators in Banach spaces. J. Math. Anal. Appl. 34: R. Cline and T. N. E. Greville. A Drazin inverse for rectangular matrices. Linear Algebra Appl. 29: D. S. Cvetković-lić J. Chen and Z. Xu. Explicit representations of the Drazin inverse of block matrix and modified matrix. Linear Multilinear Algebra 574: X. Chen and R.E. Hartwig. The group inverse of a triangular matrix. Linear Algebra Appl. 237/238: D. S. Djordjević and P. S. Stanimirović. On the generalized Drazin inverse and generalized resolvent. Czechoslovak Math. J. 5: D. Cvetković-lić D. Djordjević and. Wei. Additive results for the generalized Drazin inverse in a Banach algebra. Linear Algebra Appl. 48: M.P. Drazin. Pseudoinverse in associative rings and semigroups. Amer. Math. Monthly 65: M.P. Drazin. Extremal definitions of generalized inverses. Linear Algebra Appl. 65: K. H. Förster and B. Nagy. Transfer functions and spectral projections. Publ. Math. Debrecen 52: R. E. Harte. nvertibility and Singularity for Bounded Linear Operators. Marcel Dekker New ork R. E. Harte. Spectral projections. rish. Math. Soc. Newsletter : R.E. Hartwig and J.M. Shoaf. Group inverse and Drazin inverse of bidiagonal and triangular Toeplitz matrices. Austral. J. Math. 24A: R. Hartwig X. Li and. Wei. Representations for the Drazin inverse of 2 2 block matrix. SAM J. Matrix Anal. Appl. 27: C. F. King. A note of Drazin inverses. Pacific. J. Math. 7: J.J. Koliha. A generalized Drazin inverse. Glasgow Math. J. 38: D.C. Lay. Spectral properties of generalized inverses of linear operators. SAM J. Appl. Math. 29: X. Li and. Wei. A note on the representations for the Drazin inverse of 2 2 block matrices.
15 Drazin nverse of Bounded Operators on Banach Space 627 Linear Algebra Appl. 423: C.D. Meyer and N.J. Rose. The index and the Drazin inverse of block triangular matrices. SAM J. Appl. Math. 33: J. Miao. Result of the Drazin inverse of block matrices. J. Shanghai Normal University 8: M.Z. Nashed and. Zhao. The Drazin inverse for singular evolution equations and partial differential equations. World Sci. Ser. Appl. Anal. : V. Rakočević. Continuity of the Drazin inverse. J. Operator Theory 4: V. Rakočević and. Wei. The representation and approximation of the W-weighted Drazin inverse of linear operators in Hilbert space. Appl. Math. Comput. 4: V. Rakočević and imin Wei. The W-weighted Drazin inverse. Linear Algebra Appl. 35: Wei. Expressions for the Drazin inverse of a 2 2 block matrix. Linear Multilinear Algebra 45: Wei. Representation and perturbation of the Drazin inverse in Banach space. Chinese J. Contemporary Mathematics 2:
ADDITIVE RESULTS FOR THE GENERALIZED DRAZIN INVERSE
ADDITIVE RESULTS FOR THE GENERALIZED DRAZIN INVERSE Dragan S Djordjević and Yimin Wei Abstract Additive perturbation results for the generalized Drazin inverse of Banach space operators are presented Precisely
More informationRepresentation for the generalized Drazin inverse of block matrices in Banach algebras
Representation for the generalized Drazin inverse of block matrices in Banach algebras Dijana Mosić and Dragan S. Djordjević Abstract Several representations of the generalized Drazin inverse of a block
More informationFormulae for the generalized Drazin inverse of a block matrix in terms of Banachiewicz Schur forms
Formulae for the generalized Drazin inverse of a block matrix in terms of Banachiewicz Schur forms Dijana Mosić and Dragan S Djordjević Abstract We introduce new expressions for the generalized Drazin
More informationAdditive results for the generalized Drazin inverse in a Banach algebra
Additive results for the generalized Drazin inverse in a Banach algebra Dragana S. Cvetković-Ilić Dragan S. Djordjević and Yimin Wei* Abstract In this aer we investigate additive roerties of the generalized
More informationPerturbation of the generalized Drazin inverse
Electronic Journal of Linear Algebra Volume 21 Volume 21 (2010) Article 9 2010 Perturbation of the generalized Drazin inverse Chunyuan Deng Yimin Wei Follow this and additional works at: http://repository.uwyo.edu/ela
More informationarxiv: v1 [math.ra] 15 Jul 2013
Additive Property of Drazin Invertibility of Elements Long Wang, Huihui Zhu, Xia Zhu, Jianlong Chen arxiv:1307.3816v1 [math.ra] 15 Jul 2013 Department of Mathematics, Southeast University, Nanjing 210096,
More informationGroup inverse for the block matrix with two identical subblocks over skew fields
Electronic Journal of Linear Algebra Volume 21 Volume 21 2010 Article 7 2010 Group inverse for the block matrix with two identical subblocks over skew fields Jiemei Zhao Changjiang Bu Follow this and additional
More informationFormulas for the Drazin Inverse of Matrices over Skew Fields
Filomat 30:12 2016 3377 3388 DOI 102298/FIL1612377S Published by Faculty of Sciences and Mathematics University of Niš Serbia Available at: http://wwwpmfniacrs/filomat Formulas for the Drazin Inverse of
More informationOn EP elements, normal elements and partial isometries in rings with involution
Electronic Journal of Linear Algebra Volume 23 Volume 23 (2012 Article 39 2012 On EP elements, normal elements and partial isometries in rings with involution Weixing Chen wxchen5888@163.com Follow this
More informationDrazin Invertibility of Product and Difference of Idempotents in a Ring
Filomat 28:6 (2014), 1133 1137 DOI 10.2298/FIL1406133C Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/filomat Drazin Invertibility of
More informationMoore-Penrose-invertible normal and Hermitian elements in rings
Moore-Penrose-invertible normal and Hermitian elements in rings Dijana Mosić and Dragan S. Djordjević Abstract In this paper we present several new characterizations of normal and Hermitian elements in
More informationEP elements in rings
EP elements in rings Dijana Mosić, Dragan S. Djordjević, J. J. Koliha Abstract In this paper we present a number of new characterizations of EP elements in rings with involution in purely algebraic terms,
More informationEXPLICIT SOLUTION OF THE OPERATOR EQUATION A X + X A = B
EXPLICIT SOLUTION OF THE OPERATOR EQUATION A X + X A = B Dragan S. Djordjević November 15, 2005 Abstract In this paper we find the explicit solution of the equation A X + X A = B for linear bounded operators
More informationSome additive results on Drazin inverse
Linear Algebra and its Applications 322 (2001) 207 217 www.elsevier.com/locate/laa Some additive results on Drazin inverse Robert E. Hartwig a, Guorong Wang a,b,1, Yimin Wei c,,2 a Mathematics Department,
More informationLinear Algebra and its Applications
Linear Algebra and its Applications 432 21 1691 172 Contents lists available at ScienceDirect Linear Algebra and its Applications journal homepage: www.elsevier.com/locate/laa Drazin inverse of partitioned
More informationRepresentations for the Drazin Inverse of a Modified Matrix
Filomat 29:4 (2015), 853 863 DOI 10.2298/FIL1504853Z Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/filomat Representations for the Drazin
More informationRe-nnd solutions of the matrix equation AXB = C
Re-nnd solutions of the matrix equation AXB = C Dragana S. Cvetković-Ilić Abstract In this article we consider Re-nnd solutions of the equation AXB = C with respect to X, where A, B, C are given matrices.
More informationarxiv: v1 [math.ra] 25 Jul 2013
Representations of the Drazin inverse involving idempotents in a ring Huihui Zhu, Jianlong Chen arxiv:1307.6623v1 [math.ra] 25 Jul 2013 Abstract: We present some formulae for the Drazin inverse of difference
More informationDragan S. Djordjević. 1. Introduction
UNIFIED APPROACH TO THE REVERSE ORDER RULE FOR GENERALIZED INVERSES Dragan S Djordjević Abstract In this paper we consider the reverse order rule of the form (AB) (2) KL = B(2) TS A(2) MN for outer generalized
More informationarxiv: v1 [math.ra] 27 Jul 2013
Additive and product properties of Drazin inverses of elements in a ring arxiv:1307.7229v1 [math.ra] 27 Jul 2013 Huihui Zhu, Jianlong Chen Abstract: We study the Drazin inverses of the sum and product
More informationThe characterizations and representations for the generalized inverses with prescribed idempotents in Banach algebras
Filomat 27:5 (2013), 851 863 DOI 10.2298/FIL1305851C Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/filomat The characterizations and
More informationELA ON THE GROUP INVERSE OF LINEAR COMBINATIONS OF TWO GROUP INVERTIBLE MATRICES
ON THE GROUP INVERSE OF LINEAR COMBINATIONS OF TWO GROUP INVERTIBLE MATRICES XIAOJI LIU, LINGLING WU, AND JULIO BENíTEZ Abstract. In this paper, some formulas are found for the group inverse of ap +bq,
More informationMultiplicative Perturbation Bounds of the Group Inverse and Oblique Projection
Filomat 30: 06, 37 375 DOI 0.98/FIL67M Published by Faculty of Sciences Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/filomat Multiplicative Perturbation Bounds of the Group
More informationTHE EXPLICIT EXPRESSION OF THE DRAZIN INVERSE OF SUMS OF TWO MATRICES AND ITS APPLICATION
italian journal of pure an applie mathematics n 33 04 (45 6) 45 THE EXPLICIT EXPRESSION OF THE DRAZIN INVERSE OF SUMS OF TWO MATRICES AND ITS APPLICATION Xiaoji Liu Liang Xu College of Science Guangxi
More informationWeighted generalized Drazin inverse in rings
Weighted generalized Drazin inverse in rings Dijana Mosić and Dragan S Djordjević Abstract In this paper we introduce and investigate the weighted generalized Drazin inverse for elements in rings We also
More informationA Note on the Group Inverses of Block Matrices Over Rings
Filomat 31:1 017, 3685 369 https://doiorg/1098/fil171685z Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://wwwpmfniacrs/filomat A Note on the Group Inverses
More informationEP elements and Strongly Regular Rings
Filomat 32:1 (2018), 117 125 https://doi.org/10.2298/fil1801117y Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/filomat EP elements and
More informationSome results on the reverse order law in rings with involution
Some results on the reverse order law in rings with involution Dijana Mosić and Dragan S. Djordjević Abstract We investigate some necessary and sufficient conditions for the hybrid reverse order law (ab)
More informationFactorization of weighted EP elements in C -algebras
Factorization of weighted EP elements in C -algebras Dijana Mosić, Dragan S. Djordjević Abstract We present characterizations of weighted EP elements in C -algebras using different kinds of factorizations.
More informationOn the Moore-Penrose and the Drazin inverse of two projections on Hilbert space
On the Moore-Penrose and the Drazin inverse of two projections on Hilbert space Sonja Radosavljević and Dragan SDjordjević March 13, 2012 Abstract For two given orthogonal, generalized or hypergeneralized
More informationOperators with Compatible Ranges
Filomat : (7), 579 585 https://doiorg/98/fil7579d Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://wwwpmfniacrs/filomat Operators with Compatible Ranges
More informationarxiv: v1 [math.ra] 28 Jan 2016
The Moore-Penrose inverse in rings with involution arxiv:1601.07685v1 [math.ra] 28 Jan 2016 Sanzhang Xu and Jianlong Chen Department of Mathematics, Southeast University, Nanjing 210096, China Abstract:
More informationNonsingularity and group invertibility of linear combinations of two k-potent matrices
Nonsingularity and group invertibility of linear combinations of two k-potent matrices Julio Benítez a Xiaoji Liu b Tongping Zhu c a Departamento de Matemática Aplicada, Instituto de Matemática Multidisciplinar,
More informationThis article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution
More informationPartial isometries and EP elements in rings with involution
Electronic Journal of Linear Algebra Volume 18 Volume 18 (2009) Article 55 2009 Partial isometries and EP elements in rings with involution Dijana Mosic dragan@pmf.ni.ac.yu Dragan S. Djordjevic Follow
More informationGeneralized B-Fredholm Banach algebra elements
Generalized B-Fredholm Banach algebra elements Miloš D. Cvetković, Enrico Boasso, Snežana Č. Živković-Zlatanović Abstract Given a (not necessarily continuous) homomorphism between Banach algebras T : A
More informationThe Drazin inverses of products and differences of orthogonal projections
J Math Anal Appl 335 7 64 71 wwwelseviercom/locate/jmaa The Drazin inverses of products and differences of orthogonal projections Chun Yuan Deng School of Mathematics Science, South China Normal University,
More informationDragan S. Djordjević. 1. Introduction and preliminaries
PRODUCTS OF EP OPERATORS ON HILBERT SPACES Dragan S. Djordjević Abstract. A Hilbert space operator A is called the EP operator, if the range of A is equal with the range of its adjoint A. In this article
More informationResearch Article On the Idempotent Solutions of a Kind of Operator Equations
International Scholarly Research Network ISRN Applied Mathematics Volume 0, Article ID 84665, pages doi:0.540/0/84665 Research Article On the Idempotent Solutions of a Kind of Operator Equations Chun Yuan
More informationResearch Article Partial Isometries and EP Elements in Banach Algebras
Abstract and Applied Analysis Volume 2011, Article ID 540212, 9 pages doi:10.1155/2011/540212 Research Article Partial Isometries and EP Elements in Banach Algebras Dijana Mosić and Dragan S. Djordjević
More informationDrazin invertibility of sum and product of closed linear operators
Malaya J. Mat. 2(4)(2014) 472 481 Drazin invertibility of sum and product of closed linear operators Bekkai MESSIRDI a,, Sanaa MESSIRDI b and Miloud MESSIRDI c a Département de Mathématiques, Université
More informationThe Expression for the Group Inverse of the Anti triangular Block Matrix
Filomat 28:6 2014, 1103 1112 DOI 102298/FIL1406103D Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://wwwpmfniacrs/filomat The Expression for the Group Inverse
More informationThe Moore-Penrose inverse of differences and products of projectors in a ring with involution
The Moore-Penrose inverse of differences and products of projectors in a ring with involution Huihui ZHU [1], Jianlong CHEN [1], Pedro PATRÍCIO [2] Abstract: In this paper, we study the Moore-Penrose inverses
More informationWeighted Drazin inverse of a modified matrix
Functional Analysis, Approximation Computation 6 (2) (2014), 23 28 Published by Faculty of Sciences Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/faac Weighted Drazin inverse
More informationWorkshop on Generalized Inverse and its Applications. Invited Speakers Program Abstract
Workshop on Generalized Inverse and its Applications Invited Speakers Program Abstract Southeast University, Nanjing November 2-4, 2012 Invited Speakers: Changjiang Bu, College of Science, Harbin Engineering
More informationSCHUR COMPLEMENTS IN C ALGEBRAS
mn header will be provided by the publisher SCHUR COMPLEMENTS IN C ALGEBRAS Dragana S. Cvetković-Ilić 1, Dragan S. Djordjević 1, and Vladimir Rakočević 1 1 Department of Mathematics, Faculty of Science
More informationAPPLICATIONS OF THE HYPER-POWER METHOD FOR COMPUTING MATRIX PRODUCTS
Univ. Beograd. Publ. Eletrotehn. Fa. Ser. Mat. 15 (2004), 13 25. Available electronically at http: //matematia.etf.bg.ac.yu APPLICATIONS OF THE HYPER-POWER METHOD FOR COMPUTING MATRIX PRODUCTS Predrag
More informationThe DMP Inverse for Rectangular Matrices
Filomat 31:19 (2017, 6015 6019 https://doi.org/10.2298/fil1719015m Published by Faculty of Sciences Mathematics, University of Niš, Serbia Available at: http://.pmf.ni.ac.rs/filomat The DMP Inverse for
More informationInner image-kernel (p, q)-inverses in rings
Inner image-kernel (p, q)-inverses in rings Dijana Mosić Dragan S. Djordjević Abstract We define study the inner image-kernel inverse as natural algebraic extension of the inner inverse with prescribed
More informationDRAZIN INVERTIBILITY OF PRODUCTS
http://www.mathematik.uni-karlsruhe.de/ semlv Seminar LV, No. 26, 5 pp., 1.6.2006 DRAZIN INVERTIBILITY OF PRODUCTS CHRISTOPH SCHMOEGER Abstract. If a b are elements of an algebra, then we show that ab
More informationThe Moore-Penrose inverse of 2 2 matrices over a certain -regular ring
The Moore-Penrose inverse of 2 2 matrices over a certain -regular ring Huihui Zhu a, Jianlong Chen a,, Xiaoxiang Zhang a, Pedro Patrício b a Department of Mathematics, Southeast University, Nanjing 210096,
More informationOn pairs of generalized and hypergeneralized projections on a Hilbert space
On pairs of generalized and hypergeneralized projections on a Hilbert space Sonja Radosavljević and Dragan S Djordjević February 16 01 Abstract In this paper we characterize generalized and hypergeneralized
More informationNew Extensions of Cline s Formula for Generalized Inverses
Filomat 31:7 2017, 1973 1980 DOI 10.2298/FIL1707973Z Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/filomat New Extensions of Cline s
More informationThe Residual Spectrum and the Continuous Spectrum of Upper Triangular Operator Matrices
Filomat 28:1 (2014, 65 71 DOI 10.2298/FIL1401065H Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/filomat The Residual Spectrum and the
More informationOn Sum and Restriction of Hypo-EP Operators
Functional Analysis, Approximation and Computation 9 (1) (2017), 37 41 Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/faac On Sum and
More informationarxiv: v1 [math.ra] 14 Apr 2018
Three it representations of the core-ep inverse Mengmeng Zhou a, Jianlong Chen b,, Tingting Li c, Dingguo Wang d arxiv:180.006v1 [math.ra] 1 Apr 018 a School of Mathematics, Southeast University, Nanjing,
More informationMoore Penrose inverses and commuting elements of C -algebras
Moore Penrose inverses and commuting elements of C -algebras Julio Benítez Abstract Let a be an element of a C -algebra A satisfying aa = a a, where a is the Moore Penrose inverse of a and let b A. We
More informationRepresentations of the (b, c)-inverses in Rings with Involution
Filomat 31:9 (217), 2867 2875 htts://doiorg/12298/fil179867k Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: htt://wwwmfniacrs/filomat Reresentations of the (b,
More informationJACOBSON S LEMMA FOR DRAZIN INVERSES
JACOBSON S LEMMA FOR DRAZIN INVERSES T.Y. LAM AND PACE P. NIELSEN Abstract. If a ring element α = 1 ab is Drazin invertible, so is β = 1 ba. We show that the Drazin inverse of β is expressible by a simple
More informationarxiv: v1 [math.ra] 21 Jul 2013
Projections and Idempotents in -reducing Rings Involving the Moore-Penrose Inverse arxiv:1307.5528v1 [math.ra] 21 Jul 2013 Xiaoxiang Zhang, Shuangshuang Zhang, Jianlong Chen, Long Wang Department of Mathematics,
More informationSome Expressions for the Group Inverse of the Block Partitioned Matrices with an Invertible Subblock
Ordu University Journal of Science and Technology/ Ordu Üniversitesi ilim ve Teknoloji Dergisi Ordu Univ. J. Sci. Tech., 2018; 8(1): 100-113 Ordu Üniv. il. Tek. Derg., 2018; 8(1): 100-113 e-issn: 2146-6459
More informationREPRESENTATIONS FOR THE GENERALIZED DRAZIN INVERSE IN A BANACH ALGEBRA (COMMUNICATED BY FUAD KITTANEH)
Bulletin of Mathematical Analysis an Applications ISSN: 1821-1291, UL: http://www.bmathaa.org Volume 5 Issue 1 (2013), ages 53-64 EESENTATIONS FO THE GENEALIZED DAZIN INVESE IN A BANACH ALGEBA (COMMUNICATED
More informationDRAZIN INVERSES OF OPERATORS WITH RATIONAL RESOLVENT. Christoph Schmoeger
PUBLICATIONS DE L INSTITUT MATHÉMATIQUE Nouvelle série, tome 83(97) (2008), 37 47 DOI: 10.2298/PIM0897037S DRAZIN INVERSES OF OPERATORS WITH RATIONAL RESOLVENT Christoph Schmoeger Communicated by Stevan
More informationDisplacement rank of the Drazin inverse
Available online at www.sciencedirect.com Journal of Computational and Applied Mathematics 167 (2004) 147 161 www.elsevier.com/locate/cam Displacement rank of the Drazin inverse Huaian Diao a, Yimin Wei
More informationOn group inverse of singular Toeplitz matrices
Linear Algebra and its Applications 399 (2005) 109 123 wwwelseviercom/locate/laa On group inverse of singular Toeplitz matrices Yimin Wei a,, Huaian Diao b,1 a Department of Mathematics, Fudan Universit,
More informationof a Two-Operator Product 1
Applied Mathematical Sciences, Vol. 7, 2013, no. 130, 6465-6474 HIKARI Ltd, www.m-hikari.com http://dx.doi.org/10.12988/ams.2013.39501 Reverse Order Law for {1, 3}-Inverse of a Two-Operator Product 1 XUE
More informationarxiv: v1 [math.ra] 7 Aug 2017
ON HIRANO INVERSES IN RINGS arxiv:1708.07043v1 [math.ra] 7 Aug 2017 HUANYIN CHEN AND MARJAN SHEIBANI Abstract. We introduce and study a new class of Drazin inverses. AnelementainaringhasHiranoinversebifa
More informationOn the spectrum of linear combinations of two projections in C -algebras
On the spectrum of linear combinations of two projections in C -algebras Julio Benítez and Vladimir Rakočević Abstract In this note we study the spectrum and give estimations for the spectral radius of
More informationGENERALIZED HIRANO INVERSES IN BANACH ALGEBRAS arxiv: v1 [math.fa] 30 Dec 2018
GENERALIZED HIRANO INVERSES IN BANACH ALGEBRAS arxiv:1812.11618v1 [math.fa] 30 Dec 2018 HUANYIN CHEN AND MARJAN SHEIBANI Abstract. Let A be a Banach algebra. An element a A has generalized Hirano inverse
More informationON OPERATORS WITH AN ABSOLUTE VALUE CONDITION. In Ho Jeon and B. P. Duggal. 1. Introduction
J. Korean Math. Soc. 41 (2004), No. 4, pp. 617 627 ON OPERATORS WITH AN ABSOLUTE VALUE CONDITION In Ho Jeon and B. P. Duggal Abstract. Let A denote the class of bounded linear Hilbert space operators with
More informationSingular Value Inequalities for Real and Imaginary Parts of Matrices
Filomat 3:1 16, 63 69 DOI 1.98/FIL16163C Published by Faculty of Sciences Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/filomat Singular Value Inequalities for Real Imaginary
More informationLinear Algebra and its Applications
Linear Algebra and its Applications 433 (2010) 476 482 Contents lists available at ScienceDirect Linear Algebra and its Applications journal homepage: www.elsevier.com/locate/laa Nonsingularity of the
More informationYimin Wei a,b,,1, Xiezhang Li c,2, Fanbin Bu d, Fuzhen Zhang e. Abstract
Linear Algebra and its Applications 49 (006) 765 77 wwwelseviercom/locate/laa Relative perturbation bounds for the eigenvalues of diagonalizable and singular matrices Application of perturbation theory
More informationKey words. Index, Drazin inverse, group inverse, Moore-Penrose inverse, index splitting, proper splitting, comparison theorem, monotone iteration.
The Electronic Journal of Linear Algebra. A publication of the International Linear Algebra Society. Volume 8, pp. 83-93, June 2001. ISSN 1081-3810. http://math.technion.ac.il/iic/ela ELA ADDITIONAL RESULTS
More informationDragan S. Djordjević. 1. Motivation
ON DAVIS-AAN-WEINERGER EXTENSION TEOREM Dragan S. Djordjević Abstract. If R = where = we find a pseudo-inverse form of all solutions W = W such that A = R where A = W and R. In this paper we extend well-known
More informationOn the simplest expression of the perturbed Moore Penrose metric generalized inverse
Annals of the University of Bucharest (mathematical series) 4 (LXII) (2013), 433 446 On the simplest expression of the perturbed Moore Penrose metric generalized inverse Jianbing Cao and Yifeng Xue Communicated
More informationELA THE OPTIMAL PERTURBATION BOUNDS FOR THE WEIGHTED MOORE-PENROSE INVERSE. 1. Introduction. Let C m n be the set of complex m n matrices and C m n
Electronic Journal of Linear Algebra ISSN 08-380 Volume 22, pp. 52-538, May 20 THE OPTIMAL PERTURBATION BOUNDS FOR THE WEIGHTED MOORE-PENROSE INVERSE WEI-WEI XU, LI-XIA CAI, AND WEN LI Abstract. In this
More informationarxiv: v1 [math.ra] 24 Aug 2016
Characterizations and representations of core and dual core inverses arxiv:1608.06779v1 [math.ra] 24 Aug 2016 Jianlong Chen [1], Huihui Zhu [1,2], Pedro Patrício [2,3], Yulin Zhang [2,3] Abstract: In this
More informationSome results on matrix partial orderings and reverse order law
Electronic Journal of Linear Algebra Volume 20 Volume 20 2010 Article 19 2010 Some results on matrix partial orderings and reverse order law Julio Benitez jbenitez@mat.upv.es Xiaoji Liu Jin Zhong Follow
More informationExpressions and Perturbations for the Moore Penrose Inverse of Bounded Linear Operators in Hilbert Spaces
Filomat 30:8 (016), 155 164 DOI 10.98/FIL1608155D Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/filomat Expressions and Perturbations
More informationGeneralized left and right Weyl spectra of upper triangular operator matrices
Electronic Journal of Linear Algebra Volume 32 Volume 32 (2017 Article 3 2017 Generalized left and right Weyl spectra of upper triangular operator matrices Guojun ai 3695946@163.com Dragana S. Cvetkovic-Ilic
More informationHYPO-EP OPERATORS 1. (Received 21 May 2013; after final revision 29 November 2014; accepted 7 October 2015)
Indian J. Pure Appl. Math., 47(1): 73-84, March 2016 c Indian National Science Academy DOI: 10.1007/s13226-015-0168-x HYPO-EP OPERATORS 1 Arvind B. Patel and Mahaveer P. Shekhawat Department of Mathematics,
More informationGeneralized core inverses of matrices
Generalized core inverses of matrices Sanzhang Xu, Jianlong Chen, Julio Benítez and Dingguo Wang arxiv:179.4476v1 [math.ra 13 Sep 217 Abstract: In this paper, we introduce two new generalized inverses
More informationThe (2,2,0) Group Inverse Problem
The (2,2,0) Group Inverse Problem P. Patrício a and R.E. Hartwig b a Departamento de Matemática e Aplicações, Universidade do Minho, 4710-057 Braga, Portugal. e-mail: pedro@math.uminho.pt b Mathematics
More informationPredrag S. Stanimirović and Dragan S. Djordjević
FULL-RANK AND DETERMINANTAL REPRESENTATION OF THE DRAZIN INVERSE Predrag S. Stanimirović and Dragan S. Djordjević Abstract. In this article we introduce a full-rank representation of the Drazin inverse
More informationELA THE MINIMUM-NORM LEAST-SQUARES SOLUTION OF A LINEAR SYSTEM AND SYMMETRIC RANK-ONE UPDATES
Volume 22, pp. 480-489, May 20 THE MINIMUM-NORM LEAST-SQUARES SOLUTION OF A LINEAR SYSTEM AND SYMMETRIC RANK-ONE UPDATES XUZHOU CHEN AND JUN JI Abstract. In this paper, we study the Moore-Penrose inverse
More informationThe generalized Schur complement in group inverses and (k + 1)-potent matrices
The generalized Schur complement in group inverses and (k + 1)-potent matrices Julio Benítez Néstor Thome Abstract In this paper, two facts related to the generalized Schur complement are studied. The
More informationOn the Moore-Penrose Inverse in C -algebras
E extracta mathematicae Vol. 21, Núm. 2, 93 106 (2006) On the Moore-Penrose Inverse in C -algebras Enrico Boasso Via Cristoforo Cancellieri 2, 34137 Trieste, Italia e-mail: enrico odisseo@yahoo.it (Presented
More informationThe symmetric minimal rank solution of the matrix equation AX=B and the optimal approximation
Electronic Journal of Linear Algebra Volume 18 Volume 18 (2009 Article 23 2009 The symmetric minimal rank solution of the matrix equation AX=B and the optimal approximation Qing-feng Xiao qfxiao@hnu.cn
More informationPrincipal pivot transforms of range symmetric matrices in indefinite inner product space
Functional Analysis, Approximation and Computation 8 (2) (2016), 37 43 Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/faac Principal pivot
More informationAbel rings and super-strongly clean rings
An. Ştiinţ. Univ. Al. I. Cuza Iaşi. Mat. N.S. Tomul LXIII, 2017, f. 2 Abel rings and super-strongly clean rings Yinchun Qu Junchao Wei Received: 11.IV.2013 / Last revision: 10.XII.2013 / Accepted: 12.XII.2013
More informationMinkowski Inverse for the Range Symmetric Block Matrix with Two Identical Sub-blocks Over Skew Fields in Minkowski Space M
International Journal of Mathematics And its Applications Volume 4, Issue 4 (2016), 67 80. ISSN: 2347-1557 Available Online: http://ijmaa.in/ International Journal 2347-1557 of Mathematics Applications
More informationA GENERALIZATION OF BI IDEALS IN SEMIRINGS
BULLETIN OF THE INTERNATIONAL MATHEMATICAL VIRTUAL INSTITUTE ISSN (p) 2303-4874, ISSN (o) 2303-4955 www.imvibl.org /JOURNALS / BULLETIN Vol. 8(2018), 123-133 DOI: 10.7251/BIMVI1801123M Former BULLETIN
More informationNIL, NILPOTENT AND PI-ALGEBRAS
FUNCTIONAL ANALYSIS AND OPERATOR THEORY BANACH CENTER PUBLICATIONS, VOLUME 30 INSTITUTE OF MATHEMATICS POLISH ACADEMY OF SCIENCES WARSZAWA 1994 NIL, NILPOTENT AND PI-ALGEBRAS VLADIMÍR MÜLLER Institute
More informationSTRUCTURAL AND SPECTRAL PROPERTIES OF k-quasi- -PARANORMAL OPERATORS. Fei Zuo and Hongliang Zuo
Korean J Math (015), No, pp 49 57 http://dxdoiorg/1011568/kjm01549 STRUCTURAL AND SPECTRAL PROPERTIES OF k-quasi- -PARANORMAL OPERATORS Fei Zuo and Hongliang Zuo Abstract For a positive integer k, an operator
More informationOn polynomially -paranormal operators
Functional Analysis, Approximation and Computation 5:2 (2013), 11 16 Published by Faculty of Sciences and Mathematics, University of Niš, Serbia Available at: http://www.pmf.ni.ac.rs/faac On polynomially
More informationNote on paranormal operators and operator equations ABA = A 2 and BAB = B 2
Note on paranormal operators and operator equations ABA = A 2 and BAB = B 2 Il Ju An* Eungil Ko PDE and Functional Analysis Research Center (PARC) Seoul National University Seoul, Korea ICM Satellite Conference
More informationMatrix Inequalities by Means of Block Matrices 1
Mathematical Inequalities & Applications, Vol. 4, No. 4, 200, pp. 48-490. Matrix Inequalities by Means of Block Matrices Fuzhen Zhang 2 Department of Math, Science and Technology Nova Southeastern University,
More informationELA
Electronic Journal of Linear Algebra ISSN 181-81 A publication of te International Linear Algebra Society ttp://mat.tecnion.ac.il/iic/ela RANK AND INERTIA OF SUBMATRICES OF THE MOORE PENROSE INVERSE OF
More informationDecomposition of a ring induced by minus partial order
Electronic Journal of Linear Algebra Volume 23 Volume 23 (2012) Article 72 2012 Decomposition of a ring induced by minus partial order Dragan S Rakic rakicdragan@gmailcom Follow this and additional works
More information