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15
39
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What is the meaning of $g(U_x) ?$

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#algebraic-topology #fundamental-groups
60
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Equivalence between the existence of the angle function and the homotopy to a constant

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#general-topology #algebraic-topology #fundamental-groups
59
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Proof of Homotopy Exact Sequence from Szamuely

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#algebraic-geometry #commutative-algebra #field-theory #galois-theory #fundamental-groups
192
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Covering map with a section induces a group isomorphism between fundamental groups

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#algebraic-topology #group-isomorphism #covering-spaces #fundamental-groups
36
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Under what condition on fundamental groups there exists a map $f:X\to Y$ such that $qg=fp$

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#algebraic-topology #covering-spaces #fundamental-groups
121
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Fundamental group of the circle

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#algebraic-topology #soft-question #fundamental-groups
490
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Proof of Brouwer's fixed point theorem in Hatcher

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#algebraic-topology #fixed-point-theorems #fundamental-groups
23
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Fundamental group of simply connected 4-manifold minus a connected surface

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#manifolds #fundamental-groups
302
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Is every based embedding from $S^n$ to $\mathbb{R}^{n+1} \setminus \{0\}$ either the unit or a generator of $\pi_n(\mathbb{R}^{n+1} \setminus \{0\})$?

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#algebraic-topology #differential-topology #fundamental-groups
47
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Generators of the monodromy generating braid groups

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#algebraic-topology #fundamental-groups #braid-groups #hecke-algebras #reflection-group
40
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A question related to the homotopy of two maps

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#general-topology #algebraic-topology #homotopy-theory #fundamental-groups
73
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Nature of the intersection in Van Kampen

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#algebraic-topology #fundamental-groups
188
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Fundamental group of $S^2 \cup L$

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#algebraic-topology #fundamental-groups
222
Views

Unclear step in universal complexification proof (isomorphism of fundamental group induced by inclusion)

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#algebraic-topology #lie-groups #lie-algebras #homotopy-theory #fundamental-groups
272
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If base space of fiber bundle is simply connected then so is the total space?

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#general-topology #algebraic-topology #differential-topology #fundamental-groups #fiber-bundles

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