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15
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Using étale fundamental group to show unramifiedness of Tate module

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#elliptic-curves #fundamental-groups #algebraic-groups #arithmetic-geometry #etale-cohomology
42
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Seifert-van Kampen theorem, classical version

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#algebraic-topology #homotopy-theory #group-homomorphism #fundamental-groups
54
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Connection between homology and homotopy invariants?

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#homology-cohomology #homotopy-theory #fundamental-groups
63
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The fundamental group of $\Pi_{n=1}^\infty S^1$ with the $\operatorname{sup}$-metric

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#general-topology #algebraic-topology #homotopy-theory #fundamental-groups
74
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Attaching a copy of $S^1$ at each point of $[0, 1]$ and $S^1$ and the fundamental groups of the resulting spaces

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#general-topology #algebraic-topology #homotopy-theory #fundamental-groups
1.8k
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Hatcher problem 1.2.12

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#algebraic-topology #fundamental-groups
98
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Path structure of an odd-looking higher inductive type.

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#fundamental-groups #type-theory #homotopy-type-theory
1k
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Fundamental group of Topologists sine curve

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#fundamental-groups
1.2k
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Punctured plane

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#general-topology #algebraic-topology #fundamental-groups
708
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Fundamental groups of the projective plane

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#algebraic-topology #fundamental-groups
1.1k
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The Seifert-Van Kampen theorem as a push-out

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#general-topology #category-theory #homotopy-theory #fundamental-groups #groupoids
265
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Why is this proof that the group operation on $\pi_1(X,x_0)$ is well defined?

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#algebraic-topology #fundamental-groups
285
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Quotient Groups and Covering Spaces in Painting Hanging

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#graph-theory #algebraic-topology #covering-spaces #fundamental-groups
358
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First examples for topology of non-Hausdorff spaces

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#general-topology #homology-cohomology #group-actions #fundamental-groups #separation-axioms
106
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Difference between $\pi(X,x)=0$ and $\pi(X,x)=\{1\}$

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#general-topology #algebraic-topology #fundamental-groups

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