deformation retract
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Deformation retract — Retract redirects here. For other meanings including concepts in group theory and category theory, see Retraction (disambiguation). In topology, a branch of mathematics, a retraction [1], as the name suggests, retracts an entire space into a… … Wikipedia
deformation-retract — verb To have a deformation retract as a subspace … Wiktionary
Deformation (engineering) — This article is about deformation in engineering. For a more rigorous treatment, see Deformation (mechanics). Compressive stress results in deformation which shortens the object but also expands it outwards. In materials science, deformation is a … Wikipedia
Équivalence d'homotopie — En mathématiques, une équivalence d homotopie est une application admettant une réciproque à homotopie près. Autrement dit, deux applications sont des équivalences d homotopie réciproques si leurs composées sont homotopes à l identité sur leurs… … Wikipédia en Français
Homotopy — This article is about topology. For chemistry, see Homotopic groups. The two dashed paths shown above are homotopic relative to their endpoints. The animation represents one possible homotopy. In topology, two continuous functions from one… … Wikipedia
Mapping cylinder — In mathematics, specifically algebraic topology, the mapping cylinder of a function f between topological spaces X and Y is the quotient where the union is disjoint, and ∼ is the equivalence relation That is, the mapping cylinder Mf … Wikipedia
Diffeomorphism — In mathematics, a diffeomorphism is an isomorphism in the category of smooth manifolds. It is an invertible function that maps one differentiable manifold to another, such that both the function and its inverse are smooth. The image of a… … Wikipedia
Reduction of the structure group — In mathematics, in particular the theory of principal bundles, one can ask if a G bundle comes from a subgroup H < G. This is called reduction of the structure group (to H), and makes sense for any map H o G, which need not be an inclusion… … Wikipedia
Volume form — In mathematics, a volume form is a nowhere zero differential n form on an n manifold. Every volume form defines a measure on the manifold, and thus a means to calculate volumes in a generalized sense. A manifold has a volume form if and only if… … Wikipedia
Retraction (disambiguation) — A retraction is a public statement made to correct a previously made statement that was incorrect, invalid, or in error.Retraction may also refer to * Deformation retract or absolute retract, subjects in mathematical topology * Retract (category… … Wikipedia
