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mathematical analysis --- nonlinear analysis --- Nonlinear theories --- Nonlinear functional analysis --- Nonlinear integral equations --- Nonlinear functional analysis. --- Nonlinear integral equations. --- Nonlinear theories. --- Nonlinear problems --- Nonlinearity (Mathematics) --- Calculus --- Mathematical analysis --- Mathematical physics --- Integral equations, Nonlinear --- Integral equations --- Functional analysis --- Operations Research

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Metric fixed-point theory lies in the intersection of three main subjects: topology, functional analysis, and applied mathematics. The first fixed-point theorem, also known as contraction mapping principle, was abstracted by Banach from the papers of Liouville and Picard, in which certain differential equations were solved by using the method of successive approximation. In other words, fixed-point theory developed from applied mathematics and has developed in functional analysis and topology. Fixed-point theory is a dynamic research subject that has never lost the attention of researchers, as it is very open to development both in theoretical and practical fields. In this Special Issue, among several submissions, we selected eight papers that we believe will be interesting to researchers who study metric fixed-point theory and related applications. It is great to see that this Special Issue fulfilled its aims. There are not only theoretical results but also some applications that were based on obtained fixed-point results. In addition, the presented results have great potential to be improved, extended, and generalized in distinct ways. The published results also have a wide application potential in various qualitative sciences, including physics, economics, computer science, engineering, and so on.

b-metric --- Banach fixed point theorem --- Caristi fixed point theorem --- homotopy --- M-metric --- M-Pompeiu–Hausdorff type metric --- multivalued mapping --- fixed point --- quasi metric space --- altering distance function --- (ψ, ϕ)-quasi contraction. --- pata type contraction --- Suzuki type contraction --- C-condition --- orbital admissible mapping --- non-Archimedean quasi modular metric space --- θ-contraction --- Suzuki contraction --- simulation contraction --- R-function --- simulation function --- manageable function --- contractivity condition --- binary relation --- quasi-metric space --- left K-complete --- α–ψ-contractive mapping --- asymptotic stability --- differential and riemann-liouville fractional differential neutral systems --- linear matrix inequality

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In the past few decades, several interesting problems have been solved using fixed point theory. In addition to classical ordinary differential equations and integral equation, researchers also focus on fractional differential equations (FDE) and fractional integral equations (FIE). Indeed, FDE and FIE lead to a better understanding of several physical phenomena, which is why such differential equations have been highly appreciated and explored. We also note the importance of distinct abstract spaces, such as quasi-metric, b-metric, symmetric, partial metric, and dislocated metric. Sometimes, one of these spaces is more suitable for a particular application. Fixed point theory techniques in partial metric spaces have been used to solve classical problems of the semantic and domain theory of computer science. This book contains some very recent theoretical results related to some new types of contraction mappings defined in various types of spaces. There are also studies related to applications of the theoretical findings to mathematical models of specific problems, and their approximate computations. In this sense, this book will contribute to the area and provide directions for further developments in fixed point theory and its applications.

Research & information: general --- Mathematics & science --- common coupled fixed point --- bv(s)-metric space --- T-contraction --- weakly compatible mapping --- quasi-pseudometric --- start-point --- end-point --- fixed point --- weakly contractive --- variational inequalities --- inverse strongly monotone mappings --- demicontractive mappings --- fixed point problems --- Hadamard spaces --- geodesic space --- convex minimization problem --- resolvent --- common fixed point --- iterative scheme --- split feasibility problem --- null point problem --- generalized mixed equilibrium problem --- monotone mapping --- strong convergence --- Hilbert space --- the condition (ℰμ) --- standard three-step iteration algorithm --- uniformly convex Busemann space --- compatible maps --- common fixed points --- convex metric spaces --- q-starshaped --- fixed-point --- multivalued maps --- F-contraction --- directed graph --- metric space --- coupled fixed points --- cyclic maps --- uniformly convex Banach space --- error estimate --- equilibrium --- fixed points --- symmetric spaces --- binary relations --- T-transitivity --- regular spaces --- b-metric space --- b-metric-like spaces --- Cauchy sequence --- pre-metric space --- triangle inequality --- weakly uniformly strict contraction --- S-type tricyclic contraction --- metric spaces --- b2-metric space --- binary relation --- almost ℛg-Geraghty type contraction

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In the past few decades, several interesting problems have been solved using fixed point theory. In addition to classical ordinary differential equations and integral equation, researchers also focus on fractional differential equations (FDE) and fractional integral equations (FIE). Indeed, FDE and FIE lead to a better understanding of several physical phenomena, which is why such differential equations have been highly appreciated and explored. We also note the importance of distinct abstract spaces, such as quasi-metric, b-metric, symmetric, partial metric, and dislocated metric. Sometimes, one of these spaces is more suitable for a particular application. Fixed point theory techniques in partial metric spaces have been used to solve classical problems of the semantic and domain theory of computer science. This book contains some very recent theoretical results related to some new types of contraction mappings defined in various types of spaces. There are also studies related to applications of the theoretical findings to mathematical models of specific problems, and their approximate computations. In this sense, this book will contribute to the area and provide directions for further developments in fixed point theory and its applications.

Research & information: general --- Mathematics & science --- common coupled fixed point --- bv(s)-metric space --- T-contraction --- weakly compatible mapping --- quasi-pseudometric --- start-point --- end-point --- fixed point --- weakly contractive --- variational inequalities --- inverse strongly monotone mappings --- demicontractive mappings --- fixed point problems --- Hadamard spaces --- geodesic space --- convex minimization problem --- resolvent --- common fixed point --- iterative scheme --- split feasibility problem --- null point problem --- generalized mixed equilibrium problem --- monotone mapping --- strong convergence --- Hilbert space --- the condition (ℰμ) --- standard three-step iteration algorithm --- uniformly convex Busemann space --- compatible maps --- common fixed points --- convex metric spaces --- q-starshaped --- fixed-point --- multivalued maps --- F-contraction --- directed graph --- metric space --- coupled fixed points --- cyclic maps --- uniformly convex Banach space --- error estimate --- equilibrium --- fixed points --- symmetric spaces --- binary relations --- T-transitivity --- regular spaces --- b-metric space --- b-metric-like spaces --- Cauchy sequence --- pre-metric space --- triangle inequality --- weakly uniformly strict contraction --- S-type tricyclic contraction --- metric spaces --- b2-metric space --- binary relation --- almost ℛg-Geraghty type contraction --- common coupled fixed point --- bv(s)-metric space --- T-contraction --- weakly compatible mapping --- quasi-pseudometric --- start-point --- end-point --- fixed point --- weakly contractive --- variational inequalities --- inverse strongly monotone mappings --- demicontractive mappings --- fixed point problems --- Hadamard spaces --- geodesic space --- convex minimization problem --- resolvent --- common fixed point --- iterative scheme --- split feasibility problem --- null point problem --- generalized mixed equilibrium problem --- monotone mapping --- strong convergence --- Hilbert space --- the condition (ℰμ) --- standard three-step iteration algorithm --- uniformly convex Busemann space --- compatible maps --- common fixed points --- convex metric spaces --- q-starshaped --- fixed-point --- multivalued maps --- F-contraction --- directed graph --- metric space --- coupled fixed points --- cyclic maps --- uniformly convex Banach space --- error estimate --- equilibrium --- fixed points --- symmetric spaces --- binary relations --- T-transitivity --- regular spaces --- b-metric space --- b-metric-like spaces --- Cauchy sequence --- pre-metric space --- triangle inequality --- weakly uniformly strict contraction --- S-type tricyclic contraction --- metric spaces --- b2-metric space --- binary relation --- almost ℛg-Geraghty type contraction