Journal of Function Spaces

Unique and Non-Unique Fixed Points and their Applications


Publishing date
01 Nov 2021
Status
Closed
Submission deadline
02 Jul 2021

Lead Editor

1Government Degree College Thatyur, Thatyur, India

2University of Dar es Salaam, Dar es Salaam, Tanzania

3Vasile Goldiș Western University of Arad , Arad, Romania

This issue is now closed for submissions.
More articles will be published in the near future.

Unique and Non-Unique Fixed Points and their Applications

This issue is now closed for submissions.
More articles will be published in the near future.

Description

The origin of fixed-point theory lies in the strategy of progressive approximation utilized to demonstrate the existence of solutions of differential equations first presented in the 19th century. However, classical fixed-point theory was established as an important part of mathematical analysis in the early 20th century, by mathematicians including Luitzen Egbertus Jan Brouwer, Stephan Banach, and Juliusz Schauder. In 1922, Stephan Banach gave the condition under which the presence, as well as the uniqueness, of a fixed point is ensured.

Different outcomes relating to fixed points, fixed circles, fixed discs, fixed ellipses, and fixed elliptic discs for single-valued and multi-valued mappings have been explored for mappings that satisfy distinctive contractive conditions in various settings, and this practice is ongoing. The celebrated Banach contraction principle has several applications in solving nonlinear equations. Yet, one disadvantage is that contraction mapping forces involved mapping to be continuous throughout the metric space. It is interesting to mention here that discontinuous mapping is of great interest, as most phenomena in the real world are discontinuous in nature. In a variety of scientific issues, beginning with different branches of mathematics, the existence of a solution is comparable to the existence of a unique fixed point for a suitable mapping. Fixed-point theorems give adequate conditions under which there exists a unique fixed point for a given function, enabling us to ensure the existence of a solution to the original problem. One of the significant outcomes of fixed-point theory is when mapping under minimal suitable conditions has a unique fixed point. However, in some situations, mapping may not have a unique fixed point. Non-unique fixed points play a crucial role and it is essential to discover the necessary conditions under which mappings have non-unique fixed points and collections of non-unique fixed points include some geometric shape. In particular, non-unique fixed points of discontinuous self-mapping perform an essential role, as if the fixed point is not unique, then the set of non-unique fixed points may form a circle, disc, or ellipse, which has great potential for applications in a variety of fields.

The aim of this Special Issue is to gather research into unique and non-unique fixed points, as well as papers investigating their applications. We welcome both original research and review articles.

Potential topics include but are not limited to the following:

  • The existence of discontinuity at the fixed figure and its applications
  • Discontinuity, fixed points, and their applications
  • Generalizations of a Banach contraction and their applications
  • Geometric properties of non-unique fixed points in different spaces and related applications
  • Fixed point theorems for multi-valued mappings in different spaces and applications
  • Common fixed-point theorems in different spaces and their applications
  • Non-unique fixed-point theorems satisfying distinctive contractive conditions and their applications
  • Fixed point to fixed disc, fixed circle, fixed ellipse, or elliptic disc and related applications

Articles

  • Special Issue
  • - Volume 2021
  • - Article ID 7613684
  • - Research Article

Kannan-Type Contractions on New Extended -Metric Spaces

Hassen Aydi | Muhammad Aslam | ... | Eskandar Ameer
  • Special Issue
  • - Volume 2021
  • - Article ID 9991117
  • - Research Article

Some Coincidence and Common Fixed-Point Results on Cone -Metric Spaces over Banach Algebras with Applications to the Infinite System of Integral Equations

Ziaul Islam | Muhammad Sarwar | ... | Fahd Jarad
  • Special Issue
  • - Volume 2021
  • - Article ID 7808255
  • - Research Article

Extragradient Method for Fixed Points in CAT(0) Spaces

Yu-Pei Lv | Khurram Shabbir | ... | Jeevan Kafle
  • Special Issue
  • - Volume 2021
  • - Article ID 2200903
  • - Research Article

Fixed Point, Data Dependence, and Well-Posed Problems for Multivalued Nonlinear Contractions

Iram Iqbal | Nawab Hussain | ... | Shanza Hassan
  • Special Issue
  • - Volume 2021
  • - Article ID 9921728
  • - Research Article

Fixed Point Results for Multivalued Mappings with Applications

Arshad Khan | Muhammad Sarwar | ... | Hasanen A. Hammad
  • Special Issue
  • - Volume 2021
  • - Article ID 9914386
  • - Research Article

On a Couple of Nonlocal Singular Viscoelastic Equations with Damping and General Source Terms: Blow-Up of Solutions

Erhan Piskin | Salah Mahmoud Boulaaras | ... | Mohamed Biomy
  • Special Issue
  • - Volume 2021
  • - Article ID 8766367
  • - Research Article

An Approach of Lebesgue Integral in Fuzzy Cone Metric Spaces via Unique Coupled Fixed Point Theorems

Muhammad Talha Waheed | Saif Ur Rehman | ... | Mabrook Al-Rakhami
  • Special Issue
  • - Volume 2021
  • - Article ID 8019135
  • - Research Article

General Solution and Stability of Additive-Quadratic Functional Equation in IRN-Space

K. Tamilvanan | Nazek Alessa | ... | Ngawang Namgyel
  • Special Issue
  • - Volume 2021
  • - Article ID 5758032
  • - Research Article

On Ćirić-Prešić Operators in Metric Spaces

Narongsuk Boonsri | Satit Saejung | Kittipong Sitthikul
  • Special Issue
  • - Volume 2021
  • - Article ID 3297562
  • - Research Article

Existence and Numerical Analysis of Imperfect Testing Infectious Disease Model in the Sense of Fractional-Order Operator

Hashim M. Alshehri | Hasib Khan | Zareen A. Khan
Journal of Function Spaces
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