FIXED POINT RESULTS FOR P-1 COMPATIBLE IN FUZZY MENGER SPACE
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1 Available online at Adv. ixed Point Theory, 6 (2016), No. 4, ISSN: IXED POINT RESULTS OR P-1 COMPATIBLE IN UZZY MENGER SPACE RUCHI SINGH 1,*, A.D. SINGH 1 AND ANIL GOYAL 2 1 MVM Govt Science College, Bhopal(M.P.), India 2 UIT-RGPV, Bhopal(M.P.), India Copyright 2016 Ruchi Singh, A.D. Singh and Anil Goyal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract: In this paper we have proved fixed point theorem in uzzy Menger Space for P-1 compatible mappings which is introduced by Sevet Kutukcu and Sushil Sharma. Keywords: fuzzy Menger space; P-1 compatible mappings; common fixed point AMS Subject Classification: 47H10 and 54H Introduction and Preliminaries Menger [5] in 1942 introduced the notation of the probabilistic metric space. The probabilistic generalization of metric space appears to be well adopted for the investigation of physical quantities and physiological thresholds. Schweizer and Sklar [7] studied this concept and then the important development of Menger space theory was due to Sehgal and Bharucha-Reid [8]. Sessa [9] introduced weakly commuting maps in metric spaces. Jungck [2] enlarged this concept to compatible maps. The notion of compatible mapsin Menger spaces has been introduced by Mishra [6]. Cho [1] et al. and Sharma [10] gave fuzzy version of compatible maps and proved common fixed point theorems for compatible maps in fuzzy metric spaces. So many works have been done in fuzzy and menger space [3], [4] and [12]. Sevet Kutukcu and Sushil Sharma introduce the concept of compatible maps of type (P-1) and type (P-2), show that they are equivalent to compatible maps under certain conditions and prove a common fixed point theorem * Corresponding author address: ruchisingh0107@gmail.com Received January 22,
2 521 RUCHI SINGH, A.D. SINGH AND ANIL GOYAL for such maps in Menger spaces. Rajesh Shrivastav [11] et al. have given the definition of fuzzy probabilistic metric space and proved fixed point theorem for such space. In this paper we prove fixed point results for fuzzy probabilistic space with compatible P-1. Definition 1.1.1: A fuzzy probabilistic metric space (PM space) is an ordered pair (X,α) consisting of a nonempty set X and a mapping α from XxX into the collections of all fuzzy distribution functions αr for all α. [0,1]. or x, y X we denote the fuzzy distribution function α (x,y) by α(x,y) and α(x,y) (u) is the value of α(x,y) at u in R. The functions α(x,y) for all α. [0,1] assumed to satisfy the following conditions: (a) α(x,y) (u) = 1 u > 0 iff x = y, (b) α(x,y) (0) = 0 x, y in X, (c) α(x,y) = α(y,x) x, y in X, (d) If α(x,y) (u) = 1 and α(y,z) (v) = 1 α(x,z) (u+v) = 1 x, y,z X and u, v > 0. Definition 1.1.2: A commutative, associative and non-decreasing mapping t: [0,1] [0,1] [0,1] is a t-norm if and only if t(a,1)= a a[0,1], t(0,0)=0 and t(c,d) t(a,b) for c a, d b. Definition 1.1.3: A uzzy Menger space is a triplet (X,α,t), where (X,α) is a PM-space, t is a t-norm and the generalized triangle inequality α(x,z) (u+v) t (α(x,z) (u), α(y,z) (v)) holds for all x, y, z in X u, v > 0 and α. [0,1]. The concept of neighborhoods in uzzy Menger space is introduced as Definition 1.1.4: Let (X,α,t) be a uzzy Menger space. If x X, > 0 and (0,1), then (,) - neighborhood of x, called Ux (,), is defined by Ux (,) = {yx: α(x,y)()>(1-)}. An (,)-topology in X is the topology induced by the family {Ux (,): x X, > 0, α [0,1] and (0,1)} of neighborhood.
3 IXED POINT RESULTS OR P-1 COMPATIBLE IN UZZY MENGER SPACE 522 Remark: If t is continuous, then uzzy Menger space (X,α,t) is a Housdroff space in (,)- topology. Let (X,α,t) be a complete uzzy Menger space and AX. Then A is called a bounded set if lim inf α(x,y) (u) = 1 u x,ya Definition 1.1.5: A sequence {xn} in (X,α,t) is said to be convergent to a point x in X if for every >0and >0, there exists an integer N=N(,) such that xn Ux(,) n N or equivalently α (xn, x; ) > 1- for all n N and α[0,1]. Definition 1.1.6: A sequence {xn} in (X,α, t) is said to be cauchy sequence if for every > 0 and > 0, there exists an integer N=N(,) such that for all α[0,1] α(xn,xm; ) > 1- n, m N. Definition 1.1.7: A uzzy Menger space (X,α,t) with the continuous t-norm is said to be complete if every Cauchy sequence in X converges to a point in X for all α[0,1]. ollowing lemmas is selected from [8] and [12] respectively in fuzzy menger space. Lemma 1: Let {xn} be a sequence in a Menger space (X, α, ) with continuous t-norm and t t t. If there exists a constant k (0, 1) such that (kt) ( t) (x,x ) (x,x ) n n+1 n-1 n then {xn} is a Cauchy sequence in X. for all t > 0 and n = 1, 2,..., Lemma 2: ([12]). Let (X, α, ) be a Menger space. If there exists k (0, 1) such that (kt) (t) for all x, y X and t > 0, then x = y. (x,y) (x,y) Definition 1.1.8: Self maps A and B of a Menger space (X, α,*) are said to be compatible of type (P) if α(abxn,bbxn)(t) 1 and α(baxn,aaxn)(t) 1 t > 0, whenever{xn} is a sequence in X such that Axn,Bxn z for some z X as n.
4 523 RUCHI SINGH, A.D. SINGH AND ANIL GOYAL Definition 1.1.9: Self maps A and B of a Menger space (X, α, *) are said to be compatible of type (P-1) if α(abxnbbxn)(t) 1 for all t > 0, whenever {xn} is a sequence in X such that Axn,Bxn z for some z in X as n. 2. Main Results Theorem 1. Let A, P, Q, and S be self maps on a complete Menger space (X, α, ) with continuous t-norm and t t t, for all t [0, 1], satisfying: (1.1) P(X) S(X), Q(X) A(X), (1.2) there exists a constant k (0, 1) such that (Px,Qy)(kt) (Ax,Sy)(t) (Px,Ax)(t) (Qy,Sy)(t) (Px,Sy)( t) (Qy,Ax)((2- )t) α(px,qy)(kt) α(abx,sty)(t) *α(px,abx)(t) *α(qy,sty)(t) *α(px,sty)(βt)* α(qy,abx)((2 β)t)] x, y X, β (0, 2) and t > 0, (1.3) either P or A is continuous, (1.4) the pairs (P,A) and (Q, S) are compatible of type (P-1). Then A, P, Q and S have a unique common fixed point. Proof. Let x0 be an arbitrary point of X. By (1.1) there exists x1, x2 X such that Px0 = Sx1 = y0 and Qx1 = Ax1 = y1. Inductively, we can construct sequences{xn} and {yn} in X such that Px2n = Sx2n+1 = y2n and Qx2n+1 = Ax2n+2 = y2n+1 for n = 0, 1, 2,.... Step 1. By taking x = x2n, y = x2n+1 for all t > 0 and β = 1 q with q (0, 1) in (1.2), we have (kt) = (kt) (Px 2n,Qx 2n+1 ) (y 2n,y 2n+1 ) (t) (t) * (t) ((1-q)t) ((1 + q)t) (y 2n-1,y 2n ) (y 2n,y 2n-1 ) (y 2n+1,y 2n ) (y 2n,y 2n ) (y 2n+1,y 2n-1 ) (t) (t) (t) 1 (t) (qt) (y 2n-1,y 2n ) (y 2n-1,y 2n ) (y 2n,y 2n+1 ) (y 2n-1,y 2n ) (y 2n,y 2n+1 ) (t) (t) (qt). (y 2n-1,y 2n ) (y 2n,y 2n+1 ) (y 2n,y 2n+1 ) Since t-norm is continuous, letting q 1, we have (kt) (t) (y 2n,y 2n+1 ) (y 2n-1,y 2n ) (y 2n,y 2n+1 ) Similarly, we also have (kt) (t) (y 2n+1,y 2n+2 ) (y 2n,y 2n+1 ) (y 2n+1,y 2n+2 ) In general, for all n even or odd, we have
5 IXED POINT RESULTS OR P-1 COMPATIBLE IN UZZY MENGER SPACE 524 (kt) (t) (y n,y n+1 ) (y n-1,y n ) (y n,y n+1 ) Consequently, for p = 1, 2,..., it follows that, t (y n,y n+1 )(kt) (y n-1,y n )(t) (y n,y n+1 )( ). p k t By nothing that (y n,y n+1 )( ) 1 as p p k we have (kt) (t) (y n,y n+1 ) (y n-1,y n ) for k (0, 1) all n N and t > 0. Hence, by Lemma1, {yn} is a Cauchy sequence in X. Since (X,, ) is complete, it converges to a point z in X. Also its subsequences converge as follows: {Px2n} z, {Ax2n} z, {Qx2n+1} z and {Sx2n+1} z. Case I. A is continuous and (P,A) and (Q, S) are compatible of type(p-1). Since A is continuous, A Ax2n Az and APx2n Az. Since (P,A) is compatible of type (P-1), PPx2n Az. Step 2. By taking x = Px2n, y = x2n+1 with β= 1 in (1.2), we have (kt) (t) (t) (t) (t) (PPx 2n,Qx 2n+1 ) (ABPx 2n,Sx 2n+1 ) (PPx 2n,APx 2n ) (Qx 2n+1,Sx 2n+1 ) (PPx 2n,Sx 2n+1 ) (Qx 2n+1,APx 2n ) This implies that, as n (kt) (t) (t) (t) (t) (t) (z,az) (z,az) (Az,Az) (z,z) (z,az) (z,az) = )(t) 1 1 (t) (t) (z,az (z,az) (z,az) (z,az) Thus, by Lemma 2, it follows that z = Az. Step 3. By taking x = z, y = x2n+1 with β= 1 in (1.2), we have (kt) (t) (t) (t) (t) (Pz,Qx 2n+1 ) (Az,Sx 2n+1 ) (Pz,Az) (Qx 2n+1,Sx 2n+1) (Pz,Sx 2n+1) (Qx 2n+1,Az) This implies that, as n (z,pz)(kt) (z,z) (t) (z,pz)(t) (z,z)(t) (z,pz)(t) (z,z) (t) = 1 (t) 1 (t) 1 (z,pz) (z,pz) (z,pz) Thu by Lemma 2, it follows that z = Pz. Therefore, z = Az = Pz.
6 525 RUCHI SINGH, A.D. SINGH AND ANIL GOYAL Step 4. Since P(X) S(X), there exists w є X such that z = Pz =Sw. By taking x = x2n, y = w with β = 1 in (1.2), we have (kt) (t) (t) (t) (t) (t) (Px 2n,Qw) (Ax 2n,Sw) (Px 2n,Ax 2n ) (Qw,Sw) (Px 2n,Sw) (Qw,Ax 2n ) which implies that, as n (kt) (t) (t) (t) (t) (t) (z,qw) (z,z) (z,z) (z,qw) (z,z) (z,qw) = 1 * 1 * (t) * 1 * (t) (z,qw) (z,qw) (z,qw) Thus, by Lemma 2, we have z = Qw. Hence, Sw = z = Qw. Since (Q, S) is compatible of type (P- 1), we have QSw = SSw. Thus, Sz = Qz. Step 5. By taking x = x2n, y = z with β = 1 in (1.2) and using Step 4, we have (kt) (t) (t) (t) (t) (t) (Px 2n,Qz) (Ax 2n,Sz) (Px 2n,Ax 2n ) (Qz,Sz) (Px 2n,Sz) (Qz,Ax 2n ) which implies that, as n (kt) (t) (t) (t) (t) (t) (z,qz) (z,qz) (z,z) (Qz,Qz) (z,qz) (z,qz) = (t) 1 1 (t) 1 (t) (z,qz) (z,qz) (z,qz) (z,qz) Thus, by Lemma 2, we have z = Qz. Since Sz = Qz, we have z = Sz. Therefore, z = Az = Pz = Qz = Sz. Case II. P is continuous, and (P,A) and (Q, S) are compatible of type (P-1). Since P is continuous, PPx2n Pz and PAx2n Pz. Since (P,A) is compatible of type (P-1), AAx2n Pz. Step 6. By taking x = Ax2n, y = x2n+1 with β = 1 in (1.2), we have (kt) (t) (t) (t) (t) (PAx,Qx ) (AAx,Sx ) (PAx,AAx ) (Qx,Sx ) (PAx,Sx ) (Qx,AAx ) 2n 2n+1 2n 2n+1 2n 2n 2n+1 2n+1 2n 2n+1 2n+1 2n This implies that, as n (z,pz)(kt) (z,pz) (t) (Pz,Pz) (t) (z,z) ( t) (z,pz) (t) (z,pz) (t) = (t) 1 1 (t) (t) (z,pz) (z,pz) (z,pz) (z,pz) Thus, by Lemma 2, it follows that z = Pz. Now using Step 4and 5, we have z = Qz = Sz. Step 9. Since Q(X)A(X), there exists w X such that z = Qz =Aw. By taking x = w, y = x2n+1 with β = 1 in (1.2), we have
7 IXED POINT RESULTS OR P-1 COMPATIBLE IN UZZY MENGER SPACE 526 (kt) (t) (t) (t) (t) (t) (Pw,Qx ) (Aw,Sx ) (Pw,Aw) (Qx,Sx ) (Pw,Sx ) (Qx,Aw) 2n+1 2n+1 2n+1 2n+1 2n+1 2n+1 which implies that, as n (z,pw)(kt) (z,z) (t) (z,pw)(t) (z,z)(t) (z,pw)(t) (z,z) (t) = 1 (t) 1 (t) 1 (z,pw) (z,pw) (z,pw) Thus, by Lemma 2, we have z = Pw. Since z = Qz = Aw, Pw = Aw. Since (P,A) is compatible of type (P-1), we have Pz = Az. Thus, z = Az = Pz. Hence, z is the common fixed point of the four maps. Step 10. or uniqueness, let v (v z) be another common fixed point of A, P, Q, and S. Taking x = z, y = v with β = 1 in (1.2), we have (kt) (t) (t) (t) ( t) ((2 - )t) (Pz,Qv) (Az,Sv) (Pz,Az) (Qv,Sv) (Pz,Sv) (Qv,Az) which implies that (kt) (t) (t) (t) (t) (t) (z,v) (z,v) (z,z) (v,v) (z,v) (v,z) = (t) 1 (z,v) (z,v) (z,v) (z,v) 1 (t) (t) Thus, by Lemma 2, we have z = v. This completes the proof of the theorem. If we take A = S = IX (the identity map on X) in Theorem 1, we have the following: Corollary. Let P and Q be self maps on a complete uzzy Menger space (X,α,*) with continuous t-norm * and t*t t for all t [0, 1]. If there exists a constant k (0, 1) such that (kt) (t) (t) (t) ( t) ((2 - )t) (Px,Qy) (x,y) (x,px) (y,qy) (y,px) (x,qy) for all x, y X, β (0, 2) and t > 0, then P and Q have a unique common fixed point. Conflict of Interests The authors declare that there is no conflict of interests.
8 527 RUCHI SINGH, A.D. SINGH AND ANIL GOYAL REERENCES [1] Y. J. Cho, H. K. Pathak, S. M. Kang, and J. S. Jung, Common fixed points of compatible maps of type (β) on fuzzy metric spaces, uzzy Sets and Systems 93 (1998), [2] G. Jungck, Compatible mappings and common fixed points, Internat. J. Math. Sci. 9(1986), [3] S.Kutukcu, S. Sharma and H.Tokgoz, A ixed Point Theorem in uzzy metric Spaces, Int. Journal of Math. Analysis, 1 (2007), no. 18, [4] S. Kutukcu, A. Tuna, and A. T. Yakut, Generalized contraction mapping principle in intuitionistic Menger spaces and an application to differential equations, Appl. Math.Mech. 28 (2007), no. 6, [5] K. Menger, Statistical metric, Proc. Nat. Acad. 28 (1942), [6] S. N. Mishra, Common fixed points of compatible mappings in PM-spaces, Math. Japon.36 (1991), [7] B. Schweizer and A. Sklar, Probabilistic Metric Spaces, North-Holland, Amsterdam,1983. [8] V. M. Sehgal and A. T. Bharucha-Reid, ixed point of contraction mapping on PM spaces, Math. Systems Theory 6 (1972), [9] S. Sessa, On weak commutativity condition of mappings in fixed point considerations, Publ. Inst. Math. Beograd 32 (1982), [10] S. Sharma, Common fixed point theorems in fuzzy metric spaces, uzzy Sets and Systems 127 (2002), [11] R.Shrivastav, V.Patel and V.B.Dhagat, ixed point theorem in fuzzy menger spaces satisfying occasionally weakly compatible mappings, Int. J. of Math. Sci. & Engg. Appls., Vol.6 No.VI, 2012, [12] B. Singh and S. Jain, A fixed point theorem in Menger space through weak compatibility,j. Math. Anal. Appl. 301 (2005),
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