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Smooth functions on $\mathbb{R}^k$ as a subset of $\mathbb{R}^l$ are the same as usual.

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#differential-topology
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The cone is not immersed in $\mathbb{R}^3$

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#differential-geometry #differential-topology
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Surgery link for lens spaces

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#geometry #general-topology #algebraic-topology #differential-topology
612
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Definition of Reshetikhin-Turaev TQFT

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#geometry #general-topology #algebraic-topology #differential-topology #knot-theory
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How to Characterize Gradient Vector Fields?

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#differential-geometry #differential-topology
202
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Compute $\chi(\mathbb{C}\mathrm{P}^2)$.

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#differential-topology
142
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Variations in a Riemannian Manifold

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#differential-geometry #differential-topology #riemannian-geometry
460
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Proving that a particular submanifold of the cotangent space is Lagrangian

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#differential-geometry #differential-topology #differential-forms #symplectic-geometry
299
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Are these equivalent characterizations of closed manifolds?

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#differential-topology #manifolds
1.4k
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Mapping Degree of a Smooth Map from a Compact Manifold without Boundary

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#differential-topology
212
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Holomorphic Poincaré conjecture

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#differential-topology #complex-geometry
1.7k
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Submanifold of $\mathbb R^n$ : projections onto tangent spaces

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#differential-geometry #differential-topology #manifolds
2.1k
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Homology and cohomology: why does Poincaré duality fail for domains with boundary?

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#algebraic-topology #differential-topology #homology-cohomology
249
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How to show that a topological submanifold is a retract of an open set?

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#general-topology #differential-topology
685
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Question on "up to isotopy" when attaching two spaces

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#general-topology #algebraic-topology #differential-topology #geometric-topology

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