Fixed Point Theorems for Mapping Having The Mixed Monotone Property
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1 International Archive of Applied Sciences and Technology Int. Arch. App. Sci. Technol; Vol 5 [2]June 2014: Society of Education India [ISO9001: 2008 Certified Organization] CODEN: IAASCA IAAST ONLINE ISSN PRINT ISSN ORIGINAL ARTICLE Fixed Point Theorems for Mapping Having The Mixed Monotone Property Savitri and Nawneet Hooda Department of Mathematics DCR University of Science &TechnologyMurthal (India) savitrimalik1234@gmail.com ABSTRACT By using the mapping having the mixed monotone property we have proved a tripled fixed point theorem in partially ordered metric space. Keywords: Partially ordered set complete metric space tripled fixed point mixed monotone property. Received 20/03/2013 Revised 02/05/2014 Accepted 29/05/2014 INTRODUCTION AND PRELIMINARIES Ran and Reurings [1] firstly discussed the existence and uniqueness of fixed point for contraction type mappings in Agarwal et al [5] Bhaskar and Lakshmikantham [6] Lakshmikantham and Ciric [8] Nieto and Lopez [3] and Berinde and Borcut [7] proved some famous and well known results for the existence of a fixed point in partially ordered metric space. In 1987Guo and Lakshmikantham[2] reported with the notion of coupled fixed point. Bhaskar and Lakshmikantham [6] reconsidered the concept of coupled fixed point in partially ordered metric space in 2006.The notion of tripled fixed point was introduced by Berinde and Borcut [7] They proved some tripled and n-tupled fixed point theorems and discussed the existence and uniqueness of solutions under different conditions. In this paper we have derived a new tripled fixed point theorem for mapping having the mixed monotone property in partially ordered metric space. Definition 1.1. A partially ordered set is a set with a binary operation denoted by such that for all (i) (reflexivity) (ii) and = (anti-symmetry) (iii) and (transitivity). Definition 1.2. A sequence ( ) in a metric space is said to converge to a point denoted by lim = if lim = 0. Definition 1.3. A sequence ( ) in a metric space is said to be Cauchy Sequence if lim = 0 for all >. Definition 1.4. A metric space is complete if every Cauchy sequence in X is convergent. Definition 1.5. [7] Let X be a non-empty set and : be a map. An element ( ) is called a tripled fixed point of F if ( ) = ( ) = ( ) =. Definition 1.6. [7] Letbe a partially ordered set and :. The mapping F is said to have mixed monotone property if ( ) is monotone non-decreasing in and and is monotone non-increasing in that is for ( ) ( ) ( ) ( ) ( ) ( ). MAIN RESULT Theorem 2.1. Let(X ) be a partially ordered complete metric space. Let : be a continuous mapping having the mixed monotone property on. Assume that there exists a [01) with IAAST Vol 5[2] June P a g e 2014 Society of Education India
2 (2.1.1) for all and and if there exist points with ( ) ( ) ( ) then has a tripled fixed point in. Remark: If we have : then our theorem reduces to theorem (3.1) of Ramakant Bhardwaj [4]. Proof: Let with ( ) ( ) ( ). (2.1.2) Define the sequence ( ) ( ) and ( ) in such that = ( ) = ( ) = ( ) for all = 012 (2.1.3) We claim that ( ) ( ) are non- decreasing and ( ) is non-increasing that is. (2.1.4) From (2.1.2) and (2.1.3) we have ( ) ( ) ( ) = ( ) = ( ) = ( ).. That is equation (2.1.4) holds for n=0. Now suppose that equation (2.1.4) holds for some n that is. We shall prove that equation (2.1.4) is true for n+1. Now. Then by mixed monotone property of we have = ( ) ( ) ( ) ( ) = = ( ) ( ) ( ) ( ) = = ( ) ( ) ( ) ( ) =. Thus by mathematical induction principle equation (2.1.4) holds for all. So Now as so from (2.1.1) we have ( ) ( ( ) { 0 } If we take { 0 } equal to then which is a contradiction to the hypothesis.. (2.1.5) Again since so from(2.1.1) we have ( ) ( ( ) { 0 }. If we take { 0 } equal to then which is again a contradiction to the hypothesis.. (2.1.6) Similarly. (2.1.7) Adding (2.1.5) (2.1.6) and (2.1.7) we get + + IAAST Vol 5[2] June P a g e 2014 Society of Education India
3 { + + } h < 1. (2.1.8) Let us denote the left hand side of (2.1.8) by and use similar notation for right hand side of (2.1.8). then. Similarly we can derive and so on. We get. (2.1.9) lim = lim { + + } = 0. lim ( For each ) = lim we have = lim = By adding we get ( ). lim { + + } = 0. Hence ( ) ( ) ( ) are Cauchy sequences in X. Since X is a complete metric space there exists x y z X such that lim = lim = lim =. Thus by taking limits as n in equation (2.1.3) we get = lim = lim ( ) = (lim lim lim ) = ( ) = lim = lim ( ) = (lim lim lim ) = ( ) = lim = lim ( ) = (lim lim lim ) = ( ). Hence ( ) = ( ) = ( ) =. Hence F has a tripled fixed point. Theorem 2.2. Let(X d ) be a partially ordered complete metric space. Let : be a continuous mapping having the mixed monotone property on. Assume that there exists a [01) with { ( ( ) ( ( )} for all and ( ) and if there exist points with ( ) ( ) ( ) then has a tripled fixed point in. Remark: If we have : then our theorem reduces to theorem (3.2) of Ramakant Bhardwaj [4]. Proof. Let with ( ) ( ) ( ) (2.2.1) Define the sequence ( ) ( ) and ( ) in such that = ( ) = ( ) = ( ) for all = 012 (2.2.2) We claim that ( ) ( ) are non- decreasing and ( ) is non-increasing that is. (2.2.3) From (2.2.1) and (2.2.2) we have ( ) ( ) ( ) = ( ) = ( ) = ( ).. That is equation (2.2.3) holds for n=0. Now suppose that equation (2.2.3) holds for some n that is. We shall prove that equation (2.2.3) is true for n+1 Now. Then by mixed monotone property of we have = ( ) ( ) ( ) ( ) = = ( ) ( ) IAAST Vol 5[2] June P a g e 2014 Society of Education India
4 ( ) ( ) = = ( ) ( ) ( ) ( ) =. Thus by mathematical induction principle equation (2.2.3) holds for all So Now so from ( ) we have ( {d( ( )) d( ( ))} { 0}. This implies (2.2.4) Now so from (*) we have ( {d( ( )) d( ( ))} {0 }. This implies (2.2.5) Similarly since. (2.2.6) Adding(2.2.4) (2.2.5) and (2.2.6) we get + + h{ + + } h h = < 1. (2.2.7) Let + + = then (2.2.7) becomes h. Similarly we can derive h and so on. We get h h h. (2.2.8) lim = lim { + + } = 0. lim ( For each ) = lim we have = lim = ( ) ( + ) By adding we get (h + h + + h ). lim { + + } = 0 Hence ( ) ( ) ( ) are Cauchy sequences in X. Since X is a complete metric space there exists x y. z X such that lim = lim = lim =. Thus by taking limits as n in equations (2.2.2) we get = lim = lim ( ) = (lim lim lim ) = ( ) = lim = lim ( ) = (lim lim lim ) = ( ) = lim = lim ( ) = (lim lim lim ) = ( ) Hence ( ) = ( ) = ( ) =. Hence F has a tripled fixed point. REFERENCES 1. A C.M. Ran and M.C.B. Reurings A fixed point theorem in partially ordered sets and some applications to metric equations Proc. Amer. Math. Soc. 132(2004) pp Guo D.Lakshmi.V.Coupled fixed points of nonlinear operators with applications Nonlinear Anal. 11(1987) pp IAAST Vol 5[2] June P a g e 2014 Society of Education India
5 3. J.J. Nieto and R.R. Lopez Existence and uniqueness of fixed point in partially ordered sets and applications to ordinary differential equations Acta Math. Sinica Engl. Ser. 23 (12) (2007) pp Ramakant BhardwajCoupled fixed point thoerms in partially ordered metric space Mathematical Theory and Modeling 12(4) (2012) pp R.P. Agarwal M.A. El-Gebeily and D.O Regan Generalized contractions in partially ordered metric spaces Appl. Anal. 87 (2008) pp T.Gnana Bhaskar and V. Lakshmikantham Fixed point theorems in partially ordered metric spaces and applications Nonlinear Anal. 65 (2006) pp V.BerindeM.BorcutTripled fixed point Theorems for contractive type mappings in partially ordered metric spaces Nonlinear Anal.74(15) (2011)pp V. Lakshmikantham and L. Ciric Coupled fixed point theorems for nonlinear contractions in partially ordered metric spaces Nonlinear Anal. 70 (2009) pp Ciation of this article Savitri and Nawneet Hooda. Fixed Point Theorems for Mapping Having The Mixed Monotone Property. Int. Arch. App. Sci. Technol; Vol 5 [2] June 2014: IAAST Vol 5[2] June P a g e 2014 Society of Education India
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