This document presents several common fixed point theorems for occasionally weakly compatible mappings in fuzzy metric spaces. It begins with definitions of key concepts such as fuzzy sets, fuzzy metric spaces, occasionally weakly compatible mappings, and Cauchy sequences in fuzzy metric spaces. It then presents four main theorems that establish the existence and uniqueness of a common fixed point for self-mappings under certain contractive conditions on the mappings and using the concept of occasionally weakly compatible pairs. The proofs of the theorems are also provided.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Common Fixed Point Theorems For Occasionally Weakely Compatible Mappingsiosrjce
Som [11 ] establishes a common fixed point theorem for R-weakly Commuting mappings in a Fuzzy
metric space.The object of this Paper is to prove some fixed point theorems for occasionally Weakly compatible
mappings by improving the condition of Som[11 ].
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Common Fixed Point Theorems For Occasionally Weakely Compatible Mappingsiosrjce
Som [11 ] establishes a common fixed point theorem for R-weakly Commuting mappings in a Fuzzy
metric space.The object of this Paper is to prove some fixed point theorems for occasionally Weakly compatible
mappings by improving the condition of Som[11 ].
Fixed Point Theorem in Fuzzy Metric SpaceIJERA Editor
In this present paper on fixed point theorems in fuzzy metric space . we extended to Fuzzy Metric space
generalisation of main theorem .
Mathematics Subject Classification: 47H10, 54A40
8 fixed point theorem in complete fuzzy metric space 8 megha shrivastavaBIOLOGICAL FORUM
ABSTRACT: In this paper our works establish a new fixed point theorem for a different type of mapping in complete fuzzy metric space. Here we define a mapping by using some proved results and obtain a result on the actuality of fixed points. We inspired by the concept of Hossein Piri and Poom Kumam [15]. They introduced the fixed point theorem for generalized F-suzuki -contraction mappings in complete b-metric space. Next Robert plebaniak [16] express his idea by result “New generalized fuzzy metric space and fixed point theorem in fuzzy metric space”. This paper also induces comparing of the outcome with existing result in the literature.
Keywords: Fuzzy set, Fuzzy metric space, Cauchy sequence Non- decreasing sequence, Fixed point, Mapping.
Fixed Point Results In Fuzzy Menger Space With Common Property (E.A.)IJERA Editor
This paper presents some common fixed point theorems for weakly compatible mappings via an implicit relation in Fuzzy Menger spaces satisfying the common property (E.A)
Semicompatibility and fixed point theorem in fuzzy metric space using implici...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Common Fixed Point Theorems in Compatible Mappings of Type (P*) of Generalize...mathsjournal
In this paper, we give some new definition of Compatible mappings of type (P), type (P-1) and type (P-2) in intuitionistic generalized fuzzy metric spaces and prove Common fixed point theorems for six mappings
under the conditions of compatible mappings of type (P-1) and type (P-2) in complete intuitionistic fuzzy
metric spaces. Our results intuitionistically fuzzify the result of Muthuraj and Pandiselvi [15]
Mathematics subject classifications: 45H10, 54H25
COMMON FIXED POINT THEOREMS IN COMPATIBLE MAPPINGS OF TYPE (P*) OF GENERALIZE...mathsjournal
In this paper, we give some new definition of Compatible mappings of type (P), type (P-1) and type (P-2) in intuitionistic generalized fuzzy metric spaces and prove Common fixed point theorems for six mappings under the conditions of compatible mappings of type (P-1) and type (P-2) in complete intuitionistic fuzzy metric spaces. Our results intuitionistically fuzzify the result of Muthuraj and Pandiselvi [15]
COMMON FIXED POINT THEOREMS IN COMPATIBLE MAPPINGS OF TYPE (P*) OF GENERALIZE...mathsjournal
In this paper, we give some new definition of Compatible mappings of type (P), type (P-1) and type (P-2) in intuitionistic generalized fuzzy metric spaces and prove Common fixed point theorems for six mappings under the conditions of compatible mappings of type (P-1) and type (P-2) in complete intuitionistic fuzzy metric spaces.
COMMON FIXED POINT THEOREMS IN COMPATIBLE MAPPINGS OF TYPE (P*) OF GENERALIZE...mathsjournal
In this paper, we give some new definition of Compatible mappings of type (P), type (P-1) and type (P-2) in intuitionistic generalized fuzzy metric spaces and prove Common fixed point theorems for six mappings under the
conditions of compatible mappings of type (P-1) and type (P-2) in complete intuitionistic fuzzy metric spaces. Our results intuitionistically fuzzify the result of Muthuraj and Pandiselvi [15]
Mathematics subject classifications: 45H10, 54H25
Fixed Point Theorem in Fuzzy Metric SpaceIJERA Editor
In this present paper on fixed point theorems in fuzzy metric space . we extended to Fuzzy Metric space
generalisation of main theorem .
Mathematics Subject Classification: 47H10, 54A40
8 fixed point theorem in complete fuzzy metric space 8 megha shrivastavaBIOLOGICAL FORUM
ABSTRACT: In this paper our works establish a new fixed point theorem for a different type of mapping in complete fuzzy metric space. Here we define a mapping by using some proved results and obtain a result on the actuality of fixed points. We inspired by the concept of Hossein Piri and Poom Kumam [15]. They introduced the fixed point theorem for generalized F-suzuki -contraction mappings in complete b-metric space. Next Robert plebaniak [16] express his idea by result “New generalized fuzzy metric space and fixed point theorem in fuzzy metric space”. This paper also induces comparing of the outcome with existing result in the literature.
Keywords: Fuzzy set, Fuzzy metric space, Cauchy sequence Non- decreasing sequence, Fixed point, Mapping.
Fixed Point Results In Fuzzy Menger Space With Common Property (E.A.)IJERA Editor
This paper presents some common fixed point theorems for weakly compatible mappings via an implicit relation in Fuzzy Menger spaces satisfying the common property (E.A)
Semicompatibility and fixed point theorem in fuzzy metric space using implici...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Common Fixed Point Theorems in Compatible Mappings of Type (P*) of Generalize...mathsjournal
In this paper, we give some new definition of Compatible mappings of type (P), type (P-1) and type (P-2) in intuitionistic generalized fuzzy metric spaces and prove Common fixed point theorems for six mappings
under the conditions of compatible mappings of type (P-1) and type (P-2) in complete intuitionistic fuzzy
metric spaces. Our results intuitionistically fuzzify the result of Muthuraj and Pandiselvi [15]
Mathematics subject classifications: 45H10, 54H25
COMMON FIXED POINT THEOREMS IN COMPATIBLE MAPPINGS OF TYPE (P*) OF GENERALIZE...mathsjournal
In this paper, we give some new definition of Compatible mappings of type (P), type (P-1) and type (P-2) in intuitionistic generalized fuzzy metric spaces and prove Common fixed point theorems for six mappings under the conditions of compatible mappings of type (P-1) and type (P-2) in complete intuitionistic fuzzy metric spaces. Our results intuitionistically fuzzify the result of Muthuraj and Pandiselvi [15]
COMMON FIXED POINT THEOREMS IN COMPATIBLE MAPPINGS OF TYPE (P*) OF GENERALIZE...mathsjournal
In this paper, we give some new definition of Compatible mappings of type (P), type (P-1) and type (P-2) in intuitionistic generalized fuzzy metric spaces and prove Common fixed point theorems for six mappings under the conditions of compatible mappings of type (P-1) and type (P-2) in complete intuitionistic fuzzy metric spaces.
COMMON FIXED POINT THEOREMS IN COMPATIBLE MAPPINGS OF TYPE (P*) OF GENERALIZE...mathsjournal
In this paper, we give some new definition of Compatible mappings of type (P), type (P-1) and type (P-2) in intuitionistic generalized fuzzy metric spaces and prove Common fixed point theorems for six mappings under the
conditions of compatible mappings of type (P-1) and type (P-2) in complete intuitionistic fuzzy metric spaces. Our results intuitionistically fuzzify the result of Muthuraj and Pandiselvi [15]
Mathematics subject classifications: 45H10, 54H25
An Altering Distance Function in Fuzzy Metric Fixed Point Theoremsijtsrd
The aim of this paper is to improve conditions proposed in recently published fixed point results for complete and compact fuzzy metric spaces. For this purpose, the altering distance functions are used. Moreover, in some of the results presented the class of t-norms is extended by using the theory of countable extensions of t-norms. Dr C Vijender"An Altering Distance Function in Fuzzy Metric Fixed Point Theorems" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-5 , August 2017, URL: http://www.ijtsrd.com/papers/ijtsrd2293.pdf http://www.ijtsrd.com/mathemetics/other/2293/an-altering-distance-function-in-fuzzy-metric-fixed-point-theorems/dr-c-vijender
Existance Theory for First Order Nonlinear Random Dfferential Equartioninventionjournals
In this paper, the existence of a solution of nonlinear random differential equation of first order is proved under Caratheodory condition by using suitable fixed point theorem. 2000 Mathematics Subject Classification: 34F05, 47H10, 47H4
https://utilitasmathematica.com/index.php/Index
Utilitas Mathematica journal that publishes original research. This journal publishes mainly in areas of pure and applied mathematics, statistics and others like algebra, analysis, geometry, topology, number theory, diffrential equations, operations research, mathematical physics, computer science,mathematical economics.And it is official publication of Utilitas Mathematica Academy, Canada.
New Contraction Mappings in Dislocated Quasi - Metric SpacesIJERA Editor
In this paper the concept of new contraction mappings has been used in proving fixed point theorems. We
establish some common fixed point theorems in complete dislocated quasi metric spaces using new contraction
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Fixed Point Theorem in Fuzzy Metric Space Using (CLRg) Propertyinventionjournals
The object of this paper is to establish a common fixed point theorem for semi-compatible pair of self maps by using CLRg Property in fuzzy metric space.
Semicompatibility and fixed point theorem in fuzzy metric space using implici...eSAT Journals
Abstract In this paper we proved fixed point theorem of four mapping on fuzzy metric space based on the concept of semi copatibility using implicit relation. These results generalize several corresponding relations in fuzzy metric space. All the results of this paper are new. Keywords: fuzzy metric space, compatibility, semi compatibility, implicit relation. 2000 AMS Mathematics Subject Classification: 47H10, 54H25
Fixed points of contractive and Geraghty contraction mappings under the influ...IJERA Editor
In this paper, we prove the existence of fixed points of contractive and Geraghty contraction maps in complete metric spaces under the influence of altering distances. Our results extend and generalize some of the known results.
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On fixed point theorems in fuzzy metric spaces in integral type
1. Mathematical Theory and Modeling www.iiste.org
ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online)
Vol.3, No.6, 2013-Selected from International Conference on Recent Trends in Applied Sciences with Engineering Applications
278
On Fixed Point theorems in Fuzzy Metric Spaces in Integral Type
Shailesh T.Patel,Ramakant Bhardwaj*,Sunil Garg**
The Research Scholar of Singhania University, Pacheri Bari (Jhunjhunu)
*Truba Institutions of Engineering & I.T. Bhopal, (M.P.)
**Scientist MPCST,Bhopal.
Abstract: This paper presents some common fixed point theorems for occasionally weakly compatible mappings
in fuzzy metric spaces.
Keywords: Occasionally weakly compatible mappings,fuzzy metric space.
1. Introduction
Fuzzy set was defined by Zadeh [7], Kramosil and Michalek [5] introduced fuzzy metric space, George and
Veermani [2] modified the notion of fuzzy metric spaces with the help of continuous t-norms. Many researchers
have obtained common fixed point theorems for mappings satisfying different types, introduced the new concept
continuous mappings and established some common fixed point theorems. Open problem on the existence of
contractive definition which generates a fixed point but does not force the mappings to be continuous at the fixed
point.This paper presents some common fixed point theorems for more general .
2 Preliminary Notes
Definition 2.1 [7] A fuzzy set A in X is a function with domain X and values in [0,1].
Definition 2.2 [6] A binary operation * : [0,1]× [0,1]→[0,1] is a continuous t-norms if *is satisfying conditions:
(1) *is an commutative and associative;
(2) * is continuous;
(3) a * 1 = a for all a є [0,1];
(4) a * b ≤ c * d whenever a ≤ c and b ≤ d, and a, b, c, d є [0,1].
Definition 2.3 [2] A 3-tuple (X,M,*) is said to be a fuzzy metric space if X is an arbitrary set, * is a continuous t-
norm and M is a fuzzy set on X2
× (0,∞) satisfying the following conditions, for all x,y,z є X, s,t>0,
(f1)M(x,y,t) > 0;
(f2)M(x,y,t) = 1 if and only if x = y;
(f3) M(x,y,t) = M(y,x,t);
(f4)M(x,y,t)* M(y,z,s) ≤ M(x,z,t+s) ;
(f5)M(x,y,.): (0,∞)→(0,1] is continuous.
Then M is called a fuzzy metric on X.Then M(x,y,t) denotes the degree of nearness between x and y with respect
to t.
Definition 2.4[2]Let (X,d) be a metric space.Denotea * b = ab for all a,b є [0,1] and Md be fuzzy sets onX2
× (0,∞)
defined as follows:
Md(x,y,t)= ),( yxdt
t
+
.
Then (X, Md, *) is a fuzzy metric space.Wecall this fuzzy metric induced by a metric d as the standard
intuitionistic fuzzy metric.
Definition 2.5[2]Let (X, M, *) is a fuzzy metric space.Then
(a) a sequence {xn} in X is said to convers to x in X if for each є>o and each t>o, Nno ∈∃ such
That M(xn,x,t)>1-є for all n≥no.
(b)a sequence {xn} in X is said to cauchy to if for each є > o and each t > o, Nno ∈∃ such
That M(xn,xm,t) > 1-є for all n,m ≥ no.
(c) A fuzzy metric space in which every Cauchy sequence is convergent is said to be complete.
Definition 2.6[3] Two self mappings f and g of a fuzzy metric space (X,M,*) are called compatible if
1),,(lim =
∞→
tgfxfgxM nn
n
whenever {xn} is a sequence in X such that xgxfx n
n
n
n
==
∞→∞→
limlim
For some x in X.
Definition 2.7[1]Twoself mappings f and g of a fuzzy metric space (X,M,*) are called reciprocally continuous on
X if fxfgxn
n
=
∞→
lim and gxgfxn
n
=
∞→
lim whenever {xn} is a sequence in X such that
xgxfx n
n
n
n
==
∞→∞→
limlim for some x in X.
Lemma 2.8[4] Let X be a set, f,g owc self maps of X. If f and g have a unique point of coincidence, w = fx = gx,
then w is the unique common fixed point of f and g.
2. Mathematical Theory and Modeling www.iiste.org
ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online)
Vol.3, No.6, 2013-Selected from International Conference on Recent Trends in Applied Sciences with Engineering Applications
279
3 Main Results
Theorem 3.1Let (X, M, *) be a complete fuzzy metric space and let P,R,S and T be self-mappings of X. Let the
pairs {P,S} and {R,T} be owc.If there exists qє(0,1) such that
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗
≥
)},,(),,(),,,(),,,(),,,(),,,(),,,(),,,(min{
0
)(
tPxPxMtTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dttξ
……………(1)
For all x,y є X and for all t > o, then there exists a unique point w є X such that Pw = Sw = w and a unique point
z є X such that Rz = Tz = z. Moreover z = w so that there is a unique common fixed point of P,R,S and T.
Proof :Let the pairs {P,S} and {R,T} be owc, so there are points x,y є X such that Px = Sx and Ry = Ty. We
claim that Px = Ry. If not, by inequality (1)
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗
≥
)},,(),,(),,,(),,,(),,,(),,,(),,,(),,,(min{
0
)(
tPxPxMtTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dttξ
∫
∗
≥
)},,(),,(),,,(),,,(),,,(),,,(),,,(),,,(min{
0
)(
tPxPxMtRyPxMtRyPxMtPxRyMtRyPxMtTyTyMtPxPxMtRyPxM
dttξ
∫
∗
≥
}1),,(),,,(),,,(),,,(),,,(),,,(),,,(min{
0
)(
tRyPxMtRyPxMtRyPxMtRyPxMtTyTyMtPxPxMtRyPxM
dttξ
∫=
).,(
0
)(
tRyPxM
dttξ
Therefore Px = Ry, i.e. Px = Sx = Ry = Ty. Suppose that there is a another point z such that Pz = Sz then by
(1) we have Pz = Sz = Ry = Ty, so Px=Pz and w = Px = Sx is the unique point of coincidence of P and S.By
Lemma 2.8 w is the only common fixed point of P and S.Similarly there is a unique point z є X such that z = Rz
= Tz.
Assume that w ≠ z. we have
=∫
).,(
0
)(
qtzwM
dttξ ∫
).,(
0
)(
qtRzPwM
dttξ
∫
∗
≥
)},,(),,(),,,(),,,(),,,(),,,(),,,(),,,(min{
0
)(
tPwPwMtTzSwMtRzPwMtSwRzMtTzPwMtTzRzMtPwSwMtTzSwM
dttξ
∫
∗
≥
)},,(),,(),,,(),,,(),,,(),,,(),,,(),,,(min{
0
)(
twwMtzwMtzwMtwzMtzwMtzzMtwwMtzwM
dttξ
∫=
).,(
0
)(
tzwM
dttξ
Therefore we have z = w and z is a common fixed point of P,R,S and T. The uniqueness of the fixed point holds.
Theorem 3.2 Let (X, M, *) be a complete fuzzy metric space and let P,R,S and T be self-mappings of X. Let the
pairs {P,S} and {R,T} be owc.If there exists q є (0,1) such that
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗
≥
)}),,(),,(),,,(),,,(),,,(),,,(),,,(),,,((min{
0
)(
tPxPxMtTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dtt
φ
ξ
……………(2)
For all x, y є X and Ø: [0,1]→[0,1] such that Ø(t) > t for all 0 <t < 1, then there exists a unique common fixed
point of P,R,S and T.
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280
Proof :Let the pairs {P,S} and {R,T} be owc, so there are points x,y є X such that Px = Sx and Ry = Ty. We
claim that Px = Ry. If not, by inequality (2)
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗
≥
)}),,(),,(),,,(),,,(),,,(),,,(),,,(),,,((min{
0
)(
tPxPxMtTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dtt
φ
ξ
> ∫
)).,((
0
)(
tRyPxM
dtt
φ
ξ From Theorem 3.1
∫=
).,(
0
)(
tRyPxM
dttξ
Assume that w ≠ z. we have
=∫
).,(
0
)(
qtzwM
dttξ ∫
).,(
0
)(
qtRzPwM
dttξ
∫
∗
≥
)}),,(),,(),,,(),,,(),,,(),,,(),,,(),,,((min{
0
)(
tPwPwMtTzSwMtRzPwMtSwRzMtTzPwMtTzRzMtPwSwMtTzSwM
dtt
φ
ξ
∫=
).,(
0
)(
tzwM
dttξ From Theorem 3.1
Therefore we have z = w and z is a common fixed point of P,R,S and T. The uniqueness of the fixed point holds.
Theorem 3.3 Let (X, M, *) be a complete fuzzy metric space and let P,R,S and T be self-mappings of X. Let the
pairs {P,S} and {R,T} be owc. If there exists q є (0,1) such that
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗
≥
)}),,(),,(),,,(),,,(),,,(),,,(),,,(),,,(({
0
)(
tPxPxMtTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dtt
φ
ξ
……………(3)
For all x, y є X and Ø: [0,1]7
→[0,1] such that Ø(t,1,1,t,t,1,t) > t for all 0 <t < 1, then there exists a unique
common fixed point of P,R,S and T.
Proof: Let the pairs {P,S} and {R,T} be owc, so there are points x,y є X such that Px = Sx and Ry = Ty. We
claim that Px = Ry. If not, by inequality (3)
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗
≥
)}),,(),,(),,,(),,,(),,,(),,,(),,,(),,,(({
0
)(
tPxPxMtTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dtt
φ
ξ
∫
∗
≥
)},,(),,(),,,(),,,(),,,(),,,(),,,(),,,({
0
)(
tPxPxMtRyPxMtRyPxMtPxRyMtRyPxMtTyTyMtPxPxMtRyPxM
dtt
φ
ξ
∫
∗
≥
}1),,(),,,(),,,(),,,(),,,(),,,(),,,({
0
)(
tRyPxMtRyPxMtRyPxMtRyPxMtTyTyMtPxPxMtRyPxM
dtt
φ
ξ
∫=
)},,(),,,(),,,(),,,(,1,1),,,({
0
)(
tRyPxMtRyPxMtRyPxMtRyPxMtRyPxM
dtt
φ
ξ
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281
∫≥
).,(
0
)(
tRyPxM
dttξ
A contradiction, therefore Px = Ry, i.e. Px = Sx = Ry = Ty. Suppose that there is a another point z such that Pz =
Sz then by (3) we have Pz = Sz = Ry = Ty, so Px=Pz and w = Px = Sx is the unique point of coincidence of P
and S.By Lemma 2.8 w is the only common fixed point of P and S.Similarly there is a unique point zϵX such
that z = Rz = Tz.Thus z is a common fixed point of P,R,S and T. The uniqueness of the fixed point holds from
(3).
Theorem 3.4 Let (X, M, *) be a complete fuzzy metric space and let P,R,S and T be self-mappings of X. Let the
pairs {P,S} and {R,T} be owc.If there exists q є (0,1) for all x,y є X and t > 0
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗∗∗∗∗∗
≥
),,(),,(),,(),,(),,(),,(),,(
0
)(
tTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dttξ
………………… (4)
Then there exists a unique common fixed point of P,R,S and T.
Proof: Let the pairs {P,S} and {R,T} be owc, so there are points x,y є X such that Px = Sx and Ry = Ty. We
claim that Px = Ry. If not, by inequality (4)
We have
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗∗∗∗∗∗
≥
),,(),,(),,(),,(),,(),,(),,(
0
)(
tTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dttξ
∫
∗∗∗∗∗∗
≥
),,(),,(),,(),,(),,(),,(),,(
0
)(
tRyPxMtRyPxMtPxRyMtRyPxMtTyTyMtPxPxMtRyPxM
dttξ
∫
∗∗∗∗∗∗
≥
),,(),,(),,(),,(11),,(
0
)(
tRyPxMtRyPxMtPxRyMtRyPxMtRyPxM
dttξ
∫≥
).,(
0
)(
tRyPxM
dttξ
Thus we have Px = Ry, i.e. Px = Sx = Ry = Ty. Suppose that there is a another point z such that Pz = Sz then by
(4) we have Pz = Sz = Ry = Ty, so Px = Pz and w = Px = Sx is the unique point of coincidence of P and
S.Similarly there is a unique point z є X such that z = Rz = Tz.Thus w is a common fixed point of P,R,S and T.
Corollary 3.5 Let (X, M, *) be a complete fuzzy metric space and let P,R,S and T be self-mappings of X. Let the
pairs {P,S} and {R,T} be owc.If there exists q є (0,1) for all x,y є X and t > 0
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗∗∗∗∗∗
≥
),,(),,()2,,(),,(),,(),,(),,(
0
)(
tTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dttξ
…………………(5)
Then there exists a unique common fixed point of P,R,S and T.
Proof: We have
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗∗∗∗∗∗
≥
),,(),,()2,,(),,(),,(),,(),,(
0
)(
tTySxMtRyPxMtSxRyMtTyPxMtTyRyMtPxSxMtTySxM
dttξ
∫
∗∗∗∗∗∗∗
≥
),,(),,(),,(),,(),,(),,(),,(),,(
0
)(
tTySxMtRyPxMtRyTyMtTySxMtTyPxMtTyRyMtPxSxMtTySxM
dttξ
∫
∗∗∗∗∗
≥
),,(),,(),,(),,(),,(),,(
0
)(
tTySxMtRyPxMtTyPxMtTyRyMtPxSxMtTySxM
dttξ
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282
∫
∗∗∗∗∗∗
≥
),,(),,(),,(),,(),,(),,(),,(
0
)(
tRyPxMtRyPxMtPxRyMtRyPxMtTyTyMtPxPxMtRyPxM
dttξ
∫
∗∗∗∗∗∗
≥
),,(),,(),,(),,(11),,(
0
)(
tRyPxMtRyPxMtPxRyMtRyPxMtRyPxM
dttξ
∫≥
).,(
0
)(
tRyPxM
dttξ
And therefore from theorem 3.4, P,R,S and T have a common fixed point.
Corollary 3.6 Let (X, M, *) be a complete fuzzy metric space and let P,R,S and T be self-mappings of X. Let the
pairs {P,S} and {R,T} be owc.If there exists q є (0,1) for all x,y є X and t > 0
∫
).,(
0
)(
qtRyPxM
dttξ ∫≤
).,(
0
)(
tTySxM
dttξ …………………(6)
Then there exists a unique common fixed point of P,R,S and T.
Proof: The Proof follows from Corollary 3.5
Theorem 3.7 Let (X, M, *) be a complete fuzzy metric space.Then continuous self-mappings
S and T of X have a common fixed point in X if and only if there exites a self mapping P of X such that the
following conditions are satisfied
(i) PX ⊂ TX I SX
(ii) The pairs {P,S} and {P,T} are weakly compatible,
(iii) There exists a point q є (0,1) such that for all x,y є X and t > 0
∫
).,(
0
)(
qtRyPxM
dttξ ∫
∗∗∗∗
≥
),,(),,(),,(),,(),,(
0
)(
tSxPyMtTyPxMtTyPyMtPxSxMtTySxM
dttξ …………………(7)
Then P,S and T havea unique common fixed point.
Proof: Since compatible implies ows, the result follows from Theorem 3.4
Theorem 3.8 Let (X, M, *) be a complete fuzzy metric space and let P and R be self-mappings of X. Let the P
and R are owc.If there exists q є (0,1) for all x,y є X and t > 0
∫
).,(
0
)(
qtSySxM
dttξ ∫
+
≥
)},,(),,,(),,,(),,,(min{),,(
0
)(
tPySxMtPySyMtPxSxMtPyPxMtPyPxM
dtt
βα
ξ …………………(8)
For all x, y є X where α, β > 0, α + β > 1. Then P and S have a unique common fixed point.
Proof: Let the pairs {P,S} be owc, so there are points x є X such that Px = Sx. Suppose that exist another point y
є X for which Py = Sy. We claim that Sx = Sy. By inequality (8)
We have
∫
).,(
0
)(
qtSySxM
dttξ ∫
+
≥
)},,(),,,(),,,(),,,(min{),,(
0
)(
tPySxMtPySyMtPxSxMtPyPxMtPyPxM
dtt
βα
ξ
∫
+
=
)},,(),,,(),,,(),,,(min{),,(
0
)(
tSySxMtPySyMtSxSxMtSySxMtSySxM
dtt
βα
ξ
∫
+
=
).,()(
0
)(
tSySxM
dtt
βα
ξ
6. Mathematical Theory and Modeling www.iiste.org
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283
A contradiction, since (α+β)> 1.Therefore Sx = Sy. Therefore Px = Py and Px is unique.
From lemma2.8 , P and S have a unique fixed point.
Acknowledgement: One of the author (Dr. R.K. B.) is thankful to MPCOST Bhopal for the project No 2556
References
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[2]A.George, P.Veeramani,”On some results in fuzzy metric spaces”,Fuzzy Sets and Systems, 64 (1994), 395-
399.
[3]G.Jungck,”Compatible mappings and common fixed points (2)”,Internat.J.Math.Sci. (1988), 285-288.
[4]G.Jungck and B.E.Rhoades,”Fixed Point Theorems for Occasionally Weakly compatible Mappings”,Fixed
Point Theory, Volume 7, No. 2, 2006, 287-296.
[5]O.Kramosil and J.Michalek,”Fuzzy metric and statistical metric spaces”,Kybernetika, 11 (1975), 326-334.
[6]B.Schweizer and A.Sklar,”Statistical metric spaces”,Pacific J. Math.10 (1960),313-334
[7]L.A.Zadeh, Fuzzy sets, Inform and Control 8 (1965), 338-353.
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