A Limiting Property of the Matrix Exponential
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1 A Limiting Property of the Matrix Exponential Sebatian Trimpe Student Member IEEE and Raffaello D Andrea Fellow IEEE K(α u(t ẋ f(t ẋ (t xf(t x (t A11 A 12 Abtract A limiting property of the matrix exponential i proven: if the (11-block of a 2-by-2 block matrix become arbitrarily mall in a limiting proce the matrix exponential of that matrix tend to zero in the (11- (12- and (21-block The limiting proce i uch that either the log norm of the (11-block goe to negative infinity or for a certain polynomial dependency the matrix aociated with the larget power of the variable that tend to infinity i table The limiting property i ueful for implification of dynamic ytem that exhibit mode with ufficiently different time cale The obtained limit then implie the decoupling of the correponding dynamic Index Term Matrix exponential limiting property logarithmic norm time-cale eparation I INTRODUCTION The ubject of tudy in thi paper i the matrix exponential ( A11 K(α A exp 12 t t > (1 in the limit a K(α grow large for α in ome ene to be made precie later All matrice are complex and α i a real parameter For different clae of K(α we derive ufficient (and in one cae alo neceary condition on K(α uch that for all t > ( A11 K(α A 12 lim exp t e A22t (2 That i we are intereted in condition guaranteeing that the coupling block (12 and (21 vanih (in addition to the (11- block In addition to being an intereting matrix problem the reult can be applied to control ytem that exhibit ignificantly different time cale uch a ytem with high-gain feedback on ome tate For example conider the ytem ẋ f (t A 11 x f (t+a 12 x (t+u(t (3 ẋ (t A 21 x f (t+a 22 x (t (4 with tatic feedback on the tate x f (t (index f for fat and for low u(t K(αx f (t (5 The matrix function K(α then repreent the feedback gain parametrized by α The feedback ytem i depicted in Fig 1 A more general multi-loop feedback ytem with additional reference input i conidered in 1 The matrix exponential (1 i a fundamental matrix (ee eg 2 of the feedback ytem (3 (5 The limit (2 mean that the dynamic of x f (t and x (t are decoupled in the limit S Trimpe i with the Max Planck Intitute for Intelligent Sytem 7276 Tübingen Germany ( trimpe@tuebingenmpgde R D Andrea i with the Intitute for Dynamic Sytem and Control ETH Zurich 892 Zurich Switzerland ( rdandrea@ethzch Thi work wa upported by the Swi National Science Foundation (SNSF Fig 1 Linear ytem with feedback on the firt part of the tate vector the fat tate x f a K(α grow large In thi context we eek to determine what type of feedback yield a decoupling of the tate in feedback from the remaining one in the limit a the feedback gain become arbitrarily large Thi quetion i of interet for example when deigning multi-loop control ytem with high-gain inner loop ince a decoupling of the tate allow for a implified ytem decription and hence a implified control deign The matrix reult herein i applied in 1 to derive a time-cale eparation algorithm for a cacaded control ytem with high-gain inner feedback loop The algorithm yield a ytem decription that include the plant dynamic and the effect of the inner feedback loop The obtained repreentation i ueful for example for deigning an outer-loop controller Thi methodology i applied in the deign of a cacaded feedback control ytem for an inverted pendulum in 1 and for a balancing cube (a multi-body 3-D inverted pendulum in 3 Related to the problem tudied herein i the work by Campbell et al 4 5 The author conider the matrix exponential with it argument being a polynomial in 1/ε and derive condition for it convergence in the limit a ε + In 4 for example Campbell et al preent a neceary and ufficient condition for pointwie convergence of exp((a+b/εt t > (6 a ε + While they are intereted in general convergence to ome limit we eek condition that yield the particular limit (2; that i where the cro coupling block (12 and (21 vanih Before deriving the technical reult thi article continue with notation and preliminarie in Sec II In Sec III we etablih lemma and cite theorem that are required for the development of the main reult which follow in Sec IV The main reult are three different condition on K(α that guarantee (2: a ufficient condition that i baed on the log norm (defined in (8 of the next ection of K(α and that make no prior aumption on the function type of K(α (Theorem 3; a neceary and ufficient condition for the cae when K(α i affine (Theorem 4; and another ufficient condition for the cae when K(α ha an affine term and an additional polynomial term α r r 2 (Theorem 5 The latter two reult are baed on 4 5 while the firt one i etablihed independently of thoe Numerical example illutrating the applicability of the different theorem are given throughout in Sec IV The article conclude with remark in Sec V A preliminary verion of Theorem 3 wa firt publihed in 1 Accepted final verion Publihed in: IEEE Tranaction on Automatic Control vol 59 no 4 Apr 214 DOI: 1119/TAC c 214 IEEE Peronal ue of thi material i permitted Permiion from IEEE mut be obtained for all other ue in any current or future media including reprinting/republihing thi material for advertiing or promotional purpoe creating new collective work for reale or reditribution to erver or lit or reue of any copyrighted component of thi work in other work
2 II NOTATION AND PRELIMINARIES We ue R C and R + to denote real number complex number and nonnegative real number repectively For the derivation in the paper we work excluively with the vector 2-norm and it induced matrix norm; that i for x C n and A C pn ( n x x i 2 1/2 A max Ax (7 i1 x 1 For A C nn µ(a denote the log norm of A 6 8: µ(a : max{µ µ an eigenvalue of(a+a /2} (8 where A i the conjugate tranpoe of A We hall exploit the following propertie of µ(a 6 8: e At e µ(at (9 µ(a A (1 µ(a+b µ(a+ B (11 where AB C nn and t R + Let pec(a denote the pectrum of A C nn (the et of all eigenvalue of A ignoring algebraic multiplicity and let OLHP denote the open left half plane in C (ie OLHP : {x C : Rex < } 7 The matrix A i called table if pec(a OLHP; and it i called emitable if pec(a OLHP {} and if pec(a then i emiimple (ie it algebraic and geometric multiplicity are identical 7 The index of A denoted Index A i the mallet nonnegative integer j uch that ranka j ranka j+1 7 The Darzin invere of A i the unique matrix A D atifying AA D A D A A D AA D A D anda j+1 A D A j withj IndexA 7 9 For AB C nn define A;B : (I B D BA(I B D B 5 where I i the identity matrix The following two fact are ueful in later derivation; the proof are traightforward and therefore omitted Fact 1: Conider the matrix differential equation Ż(t AZ(t+BU(t t Z( Z (12 where Z : R + C np continuouly differentiable U : R + C mp continuou A C nn B C nm and Z C np The unique olution of (12 i Z(t e At Z + e A(t τ BU(τdτ (13 Fact 2: Let A : ab C nm be continuou Then b b A(t dt A(t dt (14 a a III LEMMAS Thi ection etablihe preliminary lemma and retate two theorem from 4 5 which are ued in Sec IV to prove the main reult of thi paper Conider the matrix ordinary differential equation (ODE: Ẋ(t (A 11 K(αX(t+A 12 Y(t X( X (15 Ẏ(t A 21 X(t+A 22 Y(t Y( Y (16 with X : R + C np and Y : R + C mp continuouly differentiable and complex matrice A 11 A 12 A 21 A 22 K(α X and Y of appropriate dimenion Notice that the matrix exponential (1 i a fundamental matrix of the ODE ytem given by (15 and (16 which i why the tudy of (15 (16 will be ueful in the later development By Fact 1 the unique olution to (15 and (16 (conidered individually are for all t X(t e (A11 K(αt X + Y(t e A22t Y + e (A11 K(α(t τ A 12 Y(τdτ (17 e A22(t τ A 21 X(τdτ (18 Lemma 2 and 3 below treat the olution (17 and (18 for different initial condition in the limit a the log norm of K(α tend to negative infinity To etablih thee two lemma the following Gronwall-type inequality i ued: Lemma 1 (adapted from 1 Theorem 19: Let v(t a(t b(t be real-valued nonnegative continuou function on J t t 1 Let κ(t be a real-valued nonnegative continuou function for t t t 1 and uppoe Then v(t a(t+b(t t κ(tv(d t J v(t ā(texp ( b(t κ(td t J t where ā(t : up τ tta(τ b(t : up τ ttb(τ and κ(t : up τ t κ(τ Lemma 2: Conider the olution (17 and (18 with the initial condition X I and Y If lim µ( K(α then for t > lim X(t and lim Y(t (19 Proof: Since lim µ( K(α there exit an α R uch that for all α α µ(a 11 K(α A 11 +µ( K(α < (2 µ(a 11 K(α A 22 < 1 (21 In the following we conider ufficiently large α uch that α α Subtituting (17 into (18 and uing the initial condition X I and Y yield Y(t + e A22(t τ A 21 e (A11 K(ατ dτ τ + e A22(t τ A 21 e (A11 K(α(τ A 12 Y(ddτ e A22(t τ A 21 e (A11 K(ατ dτ e A22(t τ A 21 e (A11 K(α(τ A 12 Y(dτ d (22 where the order of integration in the lat term wa interchanged Thi i valid by Fubini theorem 11 Prop 536
3 and the fact that the integrand i continuou and the integration region can be expreed in either of the two way: {(τ : τ t τ} or {(τ : t τ t} Uing (9 (1 Fact 2 and ubmultiplicativity of the induced matrix norm we obtain the inequality Y(t A 21 A 21 a(t+ where e A22(t τ e (A11 K(ατ dτ + A 21 A 12 e A22(t τ e (A11 K(α(τ Y( dτ d e A22 (t τ e µ(a11 K(ατ dτ + A 21 A 12 e A22 (t τ e µ(a11 K(α(τ Y( dτ d (23 a(t : A 21 κ(t Y( d (24 κ(t : A 21 A 12 e A22 (t τ e µ(a11 K(ατ dτ e A22 (t τ e µ(a11 K(α(τ dτ Applying Lemma 1 to (24 yield for all t ( Y(t ā(texp κ(td (25 where ā(t up τ t a(τ and κ(t up τ t κ(τ Next we derive bound for a(t ā(t and κ(t κ(t uing the propertie (2 (21 Firt a(t A 21 e A22 t e (µ(a11 K(α A22 τ dτ A 21 ( e A 22 t e µ(a11 K(αt ξ(α }{{} (1 by (2 A 21 ξ(α e A22 t M 1(t ξ(α where ξ(α : A 22 µ(a 11 K(α > 1 by (21 and M 1 (t : A 21 e A22 t i a continuou function in t Therefore A 21 ā(t up a(τ up τ t τ t ξ(α e A22 τ A 21 ξ(α e A22 t M 1(t ξ(α (26 Similarly we obtain a bound for κ(t With t κ(t A 21 A 12 e A22 t e µ(a11 K(α e (µ(a11 K(α A22 τ dτ A 21 A 12 ( e A 22 (t e µ(a11 K(α(t ξ(α }{{} (1 by (2 A 21 A 12 e A22 t M 2(t ξ(α ξ(α where M 2 (t : A 21 A 12 e A22 t i a continuou function in t Therefore κ(t up κ(τ up τ t τ t A 21 A 12 e A22 τ ξ(α A 21 A 12 e A22 t M 2(t ξ(α ξ(α (27 With (26 and (27 we can now bound (25 Y(t M ( 1(t ξ(α exp M 2 (t ξ(α d M ( 1(t ξ(α exp M2 (t ξ(α t M 1(t ξ(α etm2(t M(t ξ(α (28 where M(t : M 1 (te tm2(t i continuou Since lim ξ(α lim Y(t follow directly from (28 Furthermore with (17 and X I X(t e µ(a11 K(αt + A 12 e µ(a11 K(αt + A 12 ξ(α e } µ(a11 K(α(t τ {{} (1 Y(τ dτ M(τdτ (29 Therefore lim X(t for t > Lemma 3: Conider the olution (17 and (18 with the initial condition X and Y I If lim µ( K(α then for t > lim X(t and lim Y(t ea22t (3 Proof: The proof i eentially analogou to the proof of Lemma 2 Let α α uch that (2 and (21 hold Subtituting (18 into (17 and uing the initial condition X and Y I yield after interchange of integration in the econd term X(t + e (A11 K(α(t τ A 12 e A22τ dτ and therefore X(t A 12 e (A11 K(α(t τ A 12 e A22(τ A 21 X(dτ d e µ(a11 K(α(t τ e A22 τ dτ + A 12 A 21 e µ(a11 K(α(t τ e A22 (τ X( dτ d (31 Now conider the ubtitution τ t τ for the firt term in (31 and τ t+ τ for the inner integral of the econd term which yield X(t A 12 e A22 (t τ e µ(a11 K(ατ dτ + A 12 A 21
4 e A22 (t τ e µ(a11 K(α(τ X( dτ d (32 Comparing thi inequality to (23 we find that (32 i obtained from (23 by the ubtitution Y( X( A 12 A 21 and A 21 A 12 Therefore we can derive an upper bound on X(t the ame way a in the proof of Lemma 2 Correponding to (28 we get for all t X(t L(t ξ(α where the continuou function L(t i obtained from M(t by ubtituting A 12 A 21 and A 21 A 12 Thu lim X(t Furthermore with (18 and Y I Y(t e A22t A 21 A 21 ξ(α e A22 (t τ X(τ dτ e A22 (t τ L(τdτ Therefore lim Y(t e A22t and hence lim Y(t e A22t Lemma 2 and 3 are ued in the next ection to etablih one of the main reult of thi note (Theorem 3 The other two reult (Theorem 4 and 5 preented in the next ection are baed on 4 5 and in particular on: Theorem 1 (4 Theorem 1: Let AB C nn Then e (A+B/εt converge pointwie a ε + for t > if and only if B i emitable If B i emitable then lim e (A+B/εt e (I BB D At (I BB D (33 ε + Theorem 2 (5 Theorem 1: Suppoe IndexC 1 and C i emitable Then e (A+B/ε+C/εr t r > 1 (34 converge a ε + for an r 2 for all t > if and only if B;C i emitable Suppoe B;C i emitable If r > 2 then (34 converge to e A;C;B;Ct (I B;C D B;C(I C D C; (35 if r 2 then the limit of (34 i the ame a (35 except that a term i added into the exponential BC D B;C;B;Ct (36 IV MAIN RESULTS Thi ection etablihe condition on K(α that guarantee (2 In Sec IV-A a ufficient condition i preented that i baed on the log norm of K(α (Theorem 3 In Sec IV-B and IV-C we conider the cae when K(α ha a particular polynomial tructure; namely K(α K +αk 1 and (37 K(α K +αk 1 +α r K 2 r 2 (38 repectively For the affine cae (37 a neceary and ufficient condition i derived (Theorem 4; and for (38 we preent a ufficient condition (Theorem 5 Following each theorem we give numerical example in order to illutrate the applicability of the different reult If K(α repreent a feedback controller gain uch a in (5 equation (37 and (38 decribe explicit parametrization of the controller gain via the calar tuning parameter α If one eek to analyze a controller parametrization that i not explicitly given a a function of α the log norm condition can be ueful a hall be illutrated later in Example 1 The pecific functional dependencie conidered in (37 and (38 (affine and polynomial correpond to thoe that are alo tudied in 4 5 (therein a polynomial in 1/ε cf Theorem 1 and 2 A Condition Baed on the Log Norm of K(α A ufficient condition for (2 i the log norm of K(α becoming arbitrarily mall Thi reult i obtained by conidering the matrix ODE that i olved uniquely by the matrix exponential (1 and then applying Lemma 2 and 3 of Sec III Theorem 3: Let A A 11 A 12 C (n+m(n+m and let K : R C nn be a matrix function of the real parameter α If lim µ( K(α then (2 hold for all t > Proof: By Fact 1 the matrix exponential ( A11 K(α A X(t : exp 12 i the unique olution to the matrix ODE X(t t A11 K(α A 12 X(t t X( I (39 Note that X : R + C (n+m(n+m i continuouly differentiable By ubdividing X(t into block matrice of appropriate dimenion X11 (t X X(t 12 (t X 21 (t X 22 (t we can write (39 equivalently a X 11 (t A11 K(α A X 12 X11 (t 21 (t X 21 (t X 12 (t A11 K(α A X 12 X12 (t 22 (t A 22 X 22 (t A 21 X11 ( X 21 ( X12 ( X 22 ( I (4 I (41 Notice that (4 and (41 repreent the matrix ODE conidered in Lemma 2 and 3 repectively Uing thee two lemma we therefore conclude that for t > lim exp lim ( A11 K(α A 12 X11 (t X 12 (t X 21 (t X 22 (t t e A22t We illutrate Theorem 3 with the following example Example 1 (Dicretization and high-gain feedback: Conider the feedback control example from the introduction given by (3 (5 and aume a diagonal tructure for the feedback gain K(α with diagonal element k i (α Suppoe
5 we are intereted in a dicrete-time decription of the cloedloop ytem (3 (5 at a rate T > The dicretized ytem read xf (t+t x (t+t ( A11 K(α A exp 12 T xf (t (42 x (t Now aumek i (α α that i the individual controller gain are at leat a large a α Then lim µ( K(α lim max ( ki (α lim α i (43 and by Theorem 3 (42 become in the limit a x f (t+t (44 x (t+t e A22T x (t; (45 that i the low and fat dynamic are decoupled In 1 and 3 p 65 Theorem 3 i applied to control ytem that are more general than (3 (5 where in particular the controller (5 i modified to track a reference input changing at the rate T The obtained dicrete-time model of the control ytem i then ued to deign an outer-loop controller that command the reference input to the modified controller (5 which then act a the inner-loop controller of the cacaded control ytem Remark 1: Note that the function K(α i not given explicitly in Example 1 The etimate k i (α α with the diagonal tructure of K(α i enough to verify the condition of Theorem 3 In contrat the convergence reult in Sec IV-B and IV-C require an explicit decription of K(α Example 2: Conider (1 with A 1 α α 2 K(α α and t 1 Notice that K(α i table for all α > (both eigenvalue are α and that both eigenvalue go to negative infinity a α But lim µ( K(α lim max{ α α2 α 1 2 α2 } and the limit of (1 for α i (can be computed uing 7 Fact which i clearly different from (2 in the (12-block Remark 2: The preceding example how that it doe not uffice for (2 to hold that the eigenvalue of K(α tend to negative infinity B K(α Affine We tudy the limit of (1 with affine K(α a in (37 The following reult provide a neceary and ufficient condition for (2 It i obtained uing Theorem 1 Theorem 4: Let A A 11 A 12 C (m+n(m+n and let K(α K +αk 1 with K K 1 C nn and α R Then (2 hold for t > if and only if K 1 i table Proof: We firt prove ufficiency Let A11 K Ã : A 12 B : K1 (46 Since K 1 i table B i emitable and it follow from Theorem 1 (by ubtituting 1/ε with α that lim e(ã+α Bt lim e (Ã+ B/εt (I B B e D Ãt (I B B D ε + (47 Since K 1 i table it i invertible and B D K 1 1 Hence we have ( e (I B B D Ãt A11 K exp A 12 I ( exp t t I e A22t (48 where the lat equality follow from 7 Fact and i a placeholder left unpecified Therefore we get from (47 lim e(ã+α Bt e (I B B D Ãt (I B B D (49 I e A22t I e A22t (5 which complete the ufficiency part of the proof For the neceity proof aume (2 hold Firt notice that for the limit lim e (Ã+α Bt lim ε + e (Ã+ B/εt to exit it follow from Theorem 1 that B i emitable From the definition of B in (46 it can be een that thi implie that K 1 i emitable which further implie that pec( K 1 OLHP {} (51 From B being emitable and Theorem 1 it follow that (47 hold Hence the limit in (47 i equal to the limit in (2: e (I B B D Ãt (I B B D e A22t (52 Now let E11 E E 12 : e (I B B D Ãt (53 E 21 E 22 Uing B D K D 1 and (53 it follow from (52 (by conidering the firt block column that E11 (I K 1 K1 D (54 E 21 Since the matrix exponential i noningular 7 Prop 1128 E in (53 i noningular and E 11 E 21 ha full column rank Therefore (54 implie (I K 1 K1 D K 1 K1 D I From thi and the rank formula 7 Lemma 252 n rank(i rank(k 1 K1 D min{rank(k 1 rank(k1} D n it follow that K 1 ha full rank Thu alo K 1 ha full rank which implie / pec( K 1 7 Cor 266 Prop 552 Thi and (51 imply pec( K 1 OLHP ie K 1 i table Example 3: Conider 1 2 K(α αk 1 with K 1 1 Then K 1 i table and by Theorem 4 (2 hold for any A Remark 3: For K(α a in Example 3 we compute lim µ( K(α lim max{ 2α} Example 3 hence how that the condition in Theorem 3 i not a neceary condition
6 C K(α Polynomial We tudy the limit of (1 with K(α a in (38; that i compared to (37 K(α poee an additional power α r with r 2 A ufficient condition for convergence i derived uing Theorem 2 The condition i different from the ufficient condition in Theorem 3 (one doe not imply the other a hall be pointed out later Theorem 5: Let A A 11 A 12 C (m+n(m+n and let K(α K + αk 1 + α r K 2 with K K 1 K 2 C nn and αr R r 2 If K 2 i table then (2 hold for t > Proof: Let à B be a in (46 and let C : K2 Since K 2 i table C i emitable Furthermore Index C 1 ince rank(k2 2 rank( K 2 ( K 2 ha full rank Thu the aumption of Theorem 2 are atified With C D K 1 2 we get (I CD C I and B; C (I C D C B(I CD C which i emitable Therefore by Theorem 2 lim e (Ã+α B+α r Ct lim ε + e (Ã+ B/ε+ C/ε r t converge to the limit pecified by (35 and (36 where A B C are replaced by à B C We next compute the expreion (35 and (36 From B; C we get (I B; C D B; C I D I Furthermore Ã; C I A11 K A 12 I A 22 and hence Ã; C; B; C Ã; C (55 A 22 Uing thee reult expreion (35 yield the deired limit in (2 e Ã; C; B; Ct (I B; C D B; C(I C D C e A22t Since B C D K1 K B; C 2 1 K 1 I I expreion (36 i Example 4: Conider K(α αi +α 2 K 2 with K Then K 2 i table and by Theorem 5 (2 hold for any A Notice that the intability of K 1 I i irrelevant From lim µ( K(α lim max{α+ 2α2 5 α 3α2 5 } we ee that Theorem 3 i not helpful here Example 5: Conider K(α αk 1 +α r K 2 with 1 < r < and K 1 K 1 2 Theorem 5 i not helpful here ince r < 2 (neither i Theorem 2 But µ( K(α max{ α2α α r } a α ; hence (2 follow from Theorem 3 Remark 4: Example 4 and 5 how that there are problem with K(α K +αk 1 +α r K 2 which are covered by Theorem 3 but not by Theorem 5; and vice vera In general both theorem provide ufficient condition for different problem clae V CONCLUDING REMARKS The three theorem preented in thi technical note guarantee the limiting property (2 of the matrix exponential (1; eentially a large enough K(α in the (11-block force all but the (22-block of the matrix exponential to tend to zero in the limit Theorem 3 tate a ufficient condition for (2 baed on the log norm of K(α and Theorem 4 and 5 provide ufficient condition for K(α having a particular polynomial form For the affine cae (Theorem 4 the obtained condition i alo neceary Theorem 4 and 5 herein are obtained uing the reult by Campbell et al 4 5 Theorem 3 however i obtained independently of thoe reult It method of proof i baed on the matrix differential equation that i olved uniquely by the matrix exponential (1 and on bounding it olution uing a Gronwall-type inequality In contrat Campbell et al make ue of Cauchy integral formula to prove their reult in 4 for example The numerical example herein were choen to highlight pecific mathematical propertie of the reult The limiting property of the matrix exponential ha been applied to practical example in 1 (an inverted pendulum and 3 (a balancing cube Therein Theorem 3 i ued to derive a time-cale eparation algorithm that compute a dicrete-time model repreenting the plant dynamic under high-gain feedback on ome of the plant tate Thi model i then ued to deign a tabilizing outer-loop controller REFERENCES 1 S Trimpe and R D Andrea A limiting property of the matrix exponential with application to multi-loop control in Proc of the Joint 48th IEEE Conference on Deciion and Control and 28th Chinee Control Conference Shanghai PR China Dec 29 pp P Hartman Ordinary Differential Equation 2nd ed Philadelphia: Society for Indutrial and Applied Mathematic 22 3 S Trimpe and R D Andrea The Balancing Cube: A dynamic cuplture a tet bed for ditributed etimation and control IEEE Control Sytem Magazine vol 32 pp Dec S L Campbell and N J Roe Singular perturbation of autonomou linear ytem SIAM Journal on Mathematical Analyi vol 1 no 3 pp S L Campbell Singular perturbation of autonomou linear ytem II Journal of Differential Equation vol 29 no 3 pp C Moler and C van Loan Nineteen dubiou way to compute the exponential of a matrix twenty-five year later SIAM Review vol 45 no 1 pp D S Berntein Matrix mathematic: theory fact and formula 2nd ed Princeton New Jerey: Princeton Univerity Pre 29 8 I Higuera and B García-Celayeta Logarithmic norm for matrix pencil SIAM Journal on Matrix analyi and Application vol 2 no 3 pp S L Campbell and C D Meyer Generalized invere of linear tranformation Pitman Pub London 1979 ch The Darzin invere pp D Bainov and P Simeonov Integral inequalitie and application er Mathematic and it application Eat European Serie Dordrecht The Netherland: Kluwer Academic Publiher 1992 vol S Ghorpade and B Limaye A coure in multivariable calculu and analyi er Undergraduate text in mathematic Springer New York 21
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