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Product space of Circle and interval is homeomorphic to annulus

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#general-topology #solution-verification #geometric-topology
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Commensurability of two groups

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#group-theory #geometric-topology #geometric-group-theory
342
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Proving Hopf degree theorem using Pontrjagin-Thom isomorphism

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#algebraic-topology #geometric-topology
1.5k
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Solid tori, meridians, and longitudes

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#general-topology #differential-topology #geometric-topology
807
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Fixed-point free map of the 2-sphere which has order 4

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#algebraic-topology #differential-topology #geometric-topology
54
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The Fundamental Semigroups of a Topological Object?

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#abstract-algebra #general-topology #geometric-topology #semigroups
1.1k
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How to prove that there are only two kinds of 1-dim manifolds without boundary

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#general-topology #manifolds #geometric-topology
107
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Rushing's proof of an immersion of punctured torus

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#geometric-topology
521
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Lefschetz fixed point theorem in terms of cohomology

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#algebraic-topology #homology-cohomology #fixed-point-theorems #geometric-topology
246
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Question about proof of theorem 3.16. (page 219,220 and 221 ) in Hatcher

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#algebraic-topology #homology-cohomology #geometric-topology
163
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Why if $f_{\infty} \geq f(R_n)$, then no subsequence of $P_k$ can collapse to a segment?

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#geometric-topology #polygons
29
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Questions about Riemannian manifold

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#riemannian-geometry #geometric-topology
209
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Corollary 8.6 of A Primer on Mapping Class Groups

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#hyperbolic-geometry #geometric-topology
675
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What can the fixed point spaces of an involution on the Klein bottle be?

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#algebraic-topology #differential-topology #geometric-topology
55
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How does Ricci flow distinguish $S^n$ and other manifolds?

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#differential-geometry #partial-differential-equations #riemannian-geometry #geometric-topology #ricci-flow

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