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Characteristic cohomology class of 4-manifold with boundary

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Symmetric product of genus 2-surface

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182
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$\operatorname{Spin}^c(n)$ is a Lie group?

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277
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Problem from Hempel -- surfaces in Lens spaces

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#geometric-topology #low-dimensional-topology
199
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Homology class calculation

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945
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Isotopy and homeomorphism

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#general-topology #geometry #algebraic-topology #low-dimensional-topology
74
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Compact orientable surfaces embeddings

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#surfaces #low-dimensional-topology
2.7k
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A simply-connected closed surface is a sphere

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729
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How is PL knot theory related to smooth knot theory?

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676
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Cancelling 3-handles in Kirby diagrams

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#differential-topology #geometric-topology #low-dimensional-topology #kirby-diagram
92
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Let $f$ be a map from the real projective plane to the torus. Show that $f$ must be homotopic to a constant map.

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1k
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How does Thurston's geometrisation conjecture imply Poincaré's conjecture?

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683
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intersection form of $CP^2$

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573
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Classification of Bieberbach groups

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737
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Representation of (co)homology classes of $3$-manifolds by embedded surfaces

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