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This book consists of nine papers covering a number of basic ideas, concepts, and methods of nonlinear analysis, as well as some current research problems. Thus, the reader is introduced to the fascinating theory around Brouwer's fixed point theorem, to Granas' theory of topological transversality, and to some advanced techniques of critical point theory and fixed point theory. Other topics include discontinuous differential equations, new results of metric fixed point theory, robust tracker design problems for various classes of nonlinear systems, and periodic solutions in computer virus propagation models.

Research & information: general --- Mathematics & science --- Krasnosel’skiĭ’s fixed point theorem --- positive solutions --- discontinuous differential equations --- differential system --- p-Laplacian --- choquard equation --- nonhomogeneous --- nehari method --- minimax methods --- essential maps --- homotopy --- selections --- PID controller --- sliding mode control --- hybrid Taguchi real coded DNA algorithm --- perturbation estimator --- ℳ?-function --- ℳ?(λ)-function --- τ-function --- essential distance (e-distance) --- e0-metric --- Du-Hung’s fixed point theorem --- Mizoguchi-Takahashi’s fixed point theorem --- Nadler’s fixed point theorem --- Banach contraction principle --- minimax --- multiplicity --- global minima --- Brouwer fixed point theorem --- Hamadard theorem --- Poincaré–miranda theorem --- nonlinear elliptic problem --- Robin boundary condition --- gradient dependence --- sub-supersolution --- positive solution --- periodic solutions --- SEIR-KS model --- computer virus model --- n/a --- Krasnosel'skiĭ's fixed point theorem --- Du-Hung's fixed point theorem --- Mizoguchi-Takahashi's fixed point theorem --- Nadler's fixed point theorem --- Poincaré-miranda theorem

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This book consists of nine papers covering a number of basic ideas, concepts, and methods of nonlinear analysis, as well as some current research problems. Thus, the reader is introduced to the fascinating theory around Brouwer's fixed point theorem, to Granas' theory of topological transversality, and to some advanced techniques of critical point theory and fixed point theory. Other topics include discontinuous differential equations, new results of metric fixed point theory, robust tracker design problems for various classes of nonlinear systems, and periodic solutions in computer virus propagation models.

Research & information: general --- Mathematics & science --- Krasnosel'skiĭ's fixed point theorem --- positive solutions --- discontinuous differential equations --- differential system --- p-Laplacian --- choquard equation --- nonhomogeneous --- nehari method --- minimax methods --- essential maps --- homotopy --- selections --- PID controller --- sliding mode control --- hybrid Taguchi real coded DNA algorithm --- perturbation estimator --- ℳ?-function --- ℳ?(λ)-function --- τ-function --- essential distance (e-distance) --- e0-metric --- Du-Hung's fixed point theorem --- Mizoguchi-Takahashi's fixed point theorem --- Nadler's fixed point theorem --- Banach contraction principle --- minimax --- multiplicity --- global minima --- Brouwer fixed point theorem --- Hamadard theorem --- Poincaré-miranda theorem --- nonlinear elliptic problem --- Robin boundary condition --- gradient dependence --- sub-supersolution --- positive solution --- periodic solutions --- SEIR-KS model --- computer virus model --- Krasnosel'skiĭ's fixed point theorem --- positive solutions --- discontinuous differential equations --- differential system --- p-Laplacian --- choquard equation --- nonhomogeneous --- nehari method --- minimax methods --- essential maps --- homotopy --- selections --- PID controller --- sliding mode control --- hybrid Taguchi real coded DNA algorithm --- perturbation estimator --- ℳ?-function --- ℳ?(λ)-function --- τ-function --- essential distance (e-distance) --- e0-metric --- Du-Hung's fixed point theorem --- Mizoguchi-Takahashi's fixed point theorem --- Nadler's fixed point theorem --- Banach contraction principle --- minimax --- multiplicity --- global minima --- Brouwer fixed point theorem --- Hamadard theorem --- Poincaré-miranda theorem --- nonlinear elliptic problem --- Robin boundary condition --- gradient dependence --- sub-supersolution --- positive solution --- periodic solutions --- SEIR-KS model --- computer virus model

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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 essence the proceedings of the 1967 meeting in Baton Rouge, the volume offers significant papers in the topology of infinite dimensional linear spaces, fixed point theory in infinite dimensional spaces, infinite dimensional differential topology, and infinite dimensional pointset topology. Later results of the contributors underscore the basic soundness of this selection, which includes survey and expository papers, as well as reports of continuing research.

Topology --- Differential geometry. Global analysis --- Differential topology --- Functional analysis --- Congresses --- Analyse fonctionnnelle --- Geometry, Differential --- Anderson's theorem. --- Annihilator (ring theory). --- Automorphism. --- Baire measure. --- Banach algebra. --- Banach manifold. --- Banach space. --- Bounded operator. --- Cartesian product. --- Characterization (mathematics). --- Cohomology. --- Compact space. --- Complement (set theory). --- Complete metric space. --- Connected space. --- Continuous function. --- Convex set. --- Coset. --- Critical point (mathematics). --- Diagram (category theory). --- Differentiable manifold. --- Differential topology. --- Dimension (vector space). --- Dimension. --- Dimensional analysis. --- Dual space. --- Duality (mathematics). --- Endomorphism. --- Equivalence class. --- Euclidean space. --- Existential quantification. --- Explicit formulae (L-function). --- Exponential map (Riemannian geometry). --- Fixed-point theorem. --- Fréchet derivative. --- Fréchet space. --- Fuchsian group. --- Function space. --- Fundamental class. --- Haar measure. --- Hessian matrix. --- Hilbert space. --- Homeomorphism. --- Homology (mathematics). --- Homotopy group. --- Homotopy. --- Inclusion map. --- Infimum and supremum. --- Lebesgue space. --- Lefschetz fixed-point theorem. --- Limit point. --- Linear space (geometry). --- Locally convex topological vector space. --- Loop space. --- Mathematical optimization. --- Measure (mathematics). --- Metric space. --- Module (mathematics). --- Natural topology. --- Neighbourhood (mathematics). --- Normal space. --- Normed vector space. --- Open set. --- Ordinal number. --- Paracompact space. --- Partition of unity. --- Path space. --- Product topology. --- Quantifier (logic). --- Quotient space (linear algebra). --- Quotient space (topology). --- Radon measure. --- Reflexive space. --- Representation theorem. --- Riemannian manifold. --- Schauder fixed point theorem. --- Sign (mathematics). --- Simply connected space. --- Space form. --- Special case. --- Stiefel manifold. --- Strong operator topology. --- Subcategory. --- Submanifold. --- Subset. --- Tangent space. --- Teichmüller space. --- Theorem. --- Topological space. --- Topological vector space. --- Topology. --- Transfinite induction. --- Transfinite. --- Transversal (geometry). --- Transversality theorem. --- Tychonoff cube. --- Union (set theory). --- Unit sphere. --- Weak topology. --- Weakly compact. --- Differential topology - Congresses --- Functional analysis - Congresses --- Topology - Congresses --- Analyse fonctionnelle.

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There are many applications of mathematical physics in several fields of basic science and engineering. Thus, we have tried to provide the Special Issue “Modern Problems of Mathematical Physics and Their Applications” to cover the new advances of mathematical physics and its applications. In this Special Issue, we have focused on some important and challenging topics, such as integral equations, ill-posed problems, ordinary differential equations, partial differential equations, system of equations, fractional problems, linear and nonlinear problems, fuzzy problems, numerical methods, analytical methods, semi-analytical methods, convergence analysis, error analysis and mathematical models. In response to our invitation, we received 31 papers from more than 17 countries (Russia, Uzbekistan, China, USA, Kuwait, Bosnia and Herzegovina, Thailand, Pakistan, Turkey, Nigeria, Jordan, Romania, India, Iran, Argentina, Israel, Canada, etc.), of which 19 were published and 12 rejected.

Research & information: general --- Mathematics & science --- cauchy problem --- regularization --- factorization --- regular solution --- fundamental solution --- road section --- IMF SWARA --- traffic safety --- fuzzy MARCOS --- DEA --- ordinary differential equations --- analytical methods --- mathematical models --- Riccati equation --- radial Schrödinger equation --- transformations --- hyper-singular integrals --- Navier–Stokes problem --- product user experience --- enterprise network public opinion --- identification of high-risk users --- random forest algorithm --- user portrait --- controlled second-order Lagrangian --- Euler–Lagrange equations --- isoperimetric constraints --- curvilinear integral --- differential 1-form --- partition functions --- analytical extensions --- guelfand’s and gradshteyn’s --- classical gravity --- internal waves in rotating ocean --- fractional derivative --- q-Homotopy analysis transform technique --- fixed point theorem --- minimal sensitivity --- optimization --- power transform --- critical index --- secant method --- generalized secant method --- complex roots --- cressman method --- EICM --- ENSO --- SSTA --- immune system --- virus-infected cell --- effector cell --- autoimmune disease --- time-delay virus-immune model --- differential equations --- differential operators --- non-local boundary value problems --- general conditions --- integral conditions --- multipoint conditions --- composition of operators --- pseudo-differential equation --- conjugation problem --- wave factorization --- solvability condition --- measure of noncompactness --- random effect --- random operator --- Mönch’s fixed point theorem --- multi-term fractional differential equation --- Carathéodory condition --- resolvent family theory --- multi-dimensional public opinion --- topic derivation --- complex network dynamics model --- online comments --- hot events --- fluid --- flows --- dynamic --- structure --- axiomatics --- fundamental equations --- dissipation --- complete solution --- ligaments --- waves --- vortices --- plate --- wake --- drop --- impact --- boundary element method --- barrier options --- multi-asset options --- basket options --- spread options --- thrid-order differential equations --- delay --- oscillation criteria --- n/a --- radial Schrödinger equation --- Navier-Stokes problem --- Euler-Lagrange equations --- guelfand's and gradshteyn's --- Mönch's fixed point theorem --- Carathéodory condition