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Deformation retract on subspace of $S^3$

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#general-topology #algebraic-topology #retraction
94
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Non contractible subspace of $\mathbb{R}^2$

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#algebraic-topology #homotopy-theory #retraction
44
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Retracting $\mathbb{R}^3$ minus the wedge sum of two circumferences to a double torus.

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#general-topology #homotopy-theory #retraction
41
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Retraction on non-compact Stiefel manifold

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#optimization #riemannian-geometry #retraction #stiefel-manifolds
82
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Is there a name for a morphism which makes a left inverse act like a two-sided inverse?

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#category-theory #terminology #inverse-function #retraction #monomorphisms
79
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When is a freely contractible space also based contractible?

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#algebraic-topology #homotopy-theory #retraction #homotopy-extension-property
69
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Understanding 3-manifold retraction to graph

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#smooth-manifolds #low-dimensional-topology #retraction #transversality
42
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Wedge for non-good pairs

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#general-topology #algebraic-topology #homology-cohomology #retraction
91
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Can compact, non-hollow subsets of Euclidean space retract onto their topological boundary?

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#general-topology #algebraic-topology #homology-cohomology #homotopy-theory #retraction
40
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Retracts and Closed Subspaces in Discrete Spaces

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#general-topology #retraction
24
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Optimizing linear least square subjected to manifold constraints

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#optimization #manifolds #retraction
66
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What are some examples of bad pairs $(A,X)$?

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#general-topology #algebraic-topology #retraction
88
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$S^1$ has no deformation retracts other than itself

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#general-topology #algebraic-topology #homotopy-theory #fundamental-groups #retraction
41
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Homotopy equivalence vs deformation retract for analytic spaces

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#algebraic-topology #homotopy-theory #real-algebraic-geometry #retraction
58
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Fundamental group of logarithmic surface

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#algebraic-topology #fundamental-groups #retraction

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