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Maps from Sum of Projective Planes to Circle

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#general-topology #algebraic-topology #homotopy-theory #geometric-topology #projective-space
174
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Is $(\#^k \Bbb{RP}^2) \times I$ an $\mathbb{RP}^2$-irreducible 3-manifold?

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#algebraic-topology #differential-topology #geometric-topology #low-dimensional-topology
7.8k
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Length of the main diagonal of an n-dimensional cube

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#calculus #geometry #geometric-topology
290
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Reducible Heegaard splittings can be written as connected sums

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#general-topology #manifolds #geometric-topology #low-dimensional-topology
374
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What is the fundamental group of a cone?

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#geometry #geometric-topology #fundamental-groups
112
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Components of the space of immersions 2-manifold into $\mathbb R^3$

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#reference-request #differential-topology #geometric-topology #low-dimensional-topology
47
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Plane curves admitting several ways to seal it up by the disc

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#reference-request #plane-curves #geometric-topology #low-dimensional-topology
87
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Simply connected compact subsets of $\mathbb R^2$

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#algebraic-topology #geometric-topology
84
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Regular neighbourhoods of non-orintable surfaces in $S^4$

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#geometric-topology #low-dimensional-topology
228
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Compact 1-manifolds

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#general-topology #algebraic-topology #manifolds #geometric-topology #compact-manifolds
1.4k
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Self-indexing Morse function on a torus which is a height function

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#differential-geometry #differential-topology #geometric-topology #morse-theory
123
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How to prove, no tame knot is isotopic to a non tame knot?

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#geometric-topology
104
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Unbounded, closed, star-shaped set contains ray

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#compactness #geometric-topology #real-algebraic-geometry
553
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Connected sum of two "same" Klein bottles

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#geometric-topology #klein-bottle
903
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Proof of the bigon criterion

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#geometric-topology

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