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Open set in $\mathbb{C}$ with non-trivial boundary

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#general-topology #geometric-topology
344
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What is $S^3/S^1$?

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#general-topology #geometric-topology #quotient-spaces #spheres
41
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Find a connected graph that has exactly $2$ cutpoints of order $2$ and $3$ cutpoints of order $3$

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#general-topology #graph-theory #connectedness #geometric-topology
417
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Compact 3-manifolds with boundary an orientable surface

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#algebraic-topology #geometric-topology #low-dimensional-topology #manifolds-with-boundary
1.2k
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Trying to understand Heegaard diagrams

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#manifolds #geometric-topology #low-dimensional-topology
1.1k
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What is the relationship between diffeomorphisms of the sphere modulo isotopy and exotic spheres?

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#algebraic-topology #differential-topology #geometric-topology
3.4k
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What is the topology of an infinite cylinder?

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#general-topology #algebraic-topology #geometric-topology
476
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Jones polynomial invariance

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#geometric-topology #knot-theory #knot-invariants
65
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submanifold with same homology

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#algebraic-topology #geometric-topology
882
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Is Floer homology always isomorphic to the singular homology of some space?

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#differential-geometry #homology-cohomology #geometric-topology #symplectic-geometry
186
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How can we assume the first homology group of the complement is zero when constructing a Casson handle?

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#differential-topology #homotopy-theory #geometric-topology #fundamental-groups #4-manifolds
293
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What is this manifold?

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#geometry #algebraic-topology #manifolds #geometric-topology
970
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Homology 4-balls with boundary $S^3$

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#algebraic-topology #geometric-topology #low-dimensional-topology
175
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Reference of what metric can be placed on manifold?

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#differential-geometry #manifolds #riemannian-geometry #geometric-topology #curvature
115
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singular homology of a simplicial complex

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#algebraic-topology #homology-cohomology #geometric-topology #simplicial-stuff #simplicial-complex

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