Results 51 to 60 of about 446 (130)
Studies in Applied Mathematics, Volume 156, Issue 2, February 2026.ABSTRACT In this paper, we propose a decompositional (phase‐wise split) approach to solve a two‐dimensional, two‐phase (solid and liquid, say), nonlinear inverse Stefan problem. The first step is to approximate the unknown moving boundary between the two phases and the Stefan condition on that boundary using the overspecified boundary and initial data ...
Gujji Murali Mohan Reddy +2 more
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The cosymplectic Chern–Hamilton conjecture
Journal of the London Mathematical Society, Volume 113, Issue 2, February 2026.Abstract In this paper, we study the Chern–Hamilton energy functional on compact cosymplectic manifolds, fully classifying in dimension 3 those manifolds admitting a critical compatible metric for this functional. This is the case if and only if either the manifold is co‐Kähler or if it is a mapping torus of the 2‐torus by a hyperbolic toral ...
Søren Dyhr +3 more
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Solving implicit inverse problems with homotopy-based regularization path
Advances in Computational Science and EngineeringImplicit inverse problems, in which noisy observations of a physical quantity are used to infer a nonlinear functional applied to an associated function, are inherently ill posed and often exhibit non uniqueness of solutions. Such problems arise in a range of domains, including the identification of systems governed by Ordinary and Partial Differential
Parodi, Davide +3 more
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Quadruple points of regular homotopies of surfaces in 3-manifolds
Topology, 2000 Let GI denote the space of all generic immersions of a surface F into a 3-manifold M. Let q(H_t) denote the number mod 2 of quadruple points of a generic regular homotopy H_t : F -> M. We are interested in defining an invariant Q : GI -> Z/2 such that q(H_t) = Q(H_0) - Q(H_1) for any generic regular homotopy H_t : F -> M.
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Tobacco smoking model containing snuffing class. [PDF]
Heliyon, 2023 Padmavathi V +5 more
europepmc +1 more source
Computing Homotopy Classes for Diagrams. [PDF]
Discrete Comput Geom, 2023 Filakovský M, Vokřínek L.
europepmc +1 more source
On regular homotopy of branched coverings of the sphere
Manuscripta Mathematica, 1977 Let Mn be an orientable closed n-manifold and f, g: Mn→Sn branched coverings of the n-sphere Sn. It is a theorem of H. Hopf that if f and g have the same degree then f and g are homotopic. Our interest is to find out whether f and g are then also regular homotopic, that is to say whether there is a level preserving branched covering H: Mn×I→Sn×I such ...
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Automorphisms and Embeddings of Surfaces and Quadruple Points of Regular Homotopies
Journal of Differential Geometry, 2001 The author studies a regular homotopy invariant \(Q(\cdot,\cdot)\) of immersions. Let \(i,\;i':F\to \mathbb{R}^3\) be two generic immersions of an orientable closed surface \(F\) to 3-dimensional Euclidean space \(\mathbb{R}^3\), having a generic regular homotopy between them.
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On Homotopy Regular Morphism in the Category of Topological Pairs
Pure Mathematics, 2013 本文将点标拓扑空间范畴中的同伦单、同伦满和同伦正则态射等概念推广到拓扑空间偶范畴的情形。研究了在中，同伦正则态射存在的条件、性质以及它与同伦单(满)态和同伦等价之间的关系。 In this paper, the concepts of homotopy monomorphism (epimorphism) and homotopy regular morphism in the category of topological space with base point are generalized to the category of topological pairs .
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Dynamical system of a time-delayed of rigid rocking rod: analytical approximate solution. [PDF]
Sci Rep, 2023 Moatimid GM, Amer TS.
europepmc +1 more source