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15
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Computing the fundamental group of a union of subspaces

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#general-topology #algebraic-topology #fundamental-groups #retraction
69
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Arcwise connected components under a retraction on two points

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#general-topology #algebraic-topology #path-connected #retraction
58
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No homotopy with the identity of the unit circle

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#general-topology #algebraic-topology #homotopy-theory #retraction
17
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Morse flow: cancelling handle pairs away from deformation retract

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#homotopy-theory #morse-theory #gradient-flows #retraction
85
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Retraction onto subgroup?

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#group-theory #finite-groups #retraction
57
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Statement from Proposition 0.18 of Hatcher

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#algebraic-topology #homotopy-theory #quotient-spaces #retraction
104
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An example of a retract that is not a deformation retract.

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#algebraic-topology #fundamental-groups #retraction
225
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What is special about retraction mapping?

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#homotopy-theory #retraction
49
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Say if the following function is nulhomotopic

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#algebraic-topology #homotopy-theory #retraction
218
Views

A compact convex subset is a strong deformation retract

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#algebraic-topology #homotopy-theory #retraction
374
Views

If $H$ is an induced subgraph $G$ and there is a homomorphism $G\to H$, then $H$ is a retract of $G$?

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#graph-theory #retraction
208
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Is retract of a finitely generated Hopfian group Hopfian?

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#group-theory #group-homomorphism #retraction #hopfian
382
Views

$A\times Y$ is retract of $X\times Y$ iff $A$ is retract of $X$

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#general-topology #algebraic-topology #retraction
534
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continuous, closed and surjective not open.

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#general-topology #algebraic-topology #continuity #retraction
311
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deformation retract of contractible spaces

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#general-topology #algebraic-topology #homotopy-theory #geometric-topology #retraction

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