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15
117
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Universal cover of a connected groupoid

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#group-theory #category-theory #groupoids
171
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A groupoid that is not a fundamental groupoid

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#algebraic-topology #fundamental-groups #groupoids
95
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Is the Mathieu Groupoid $M_{13}$ even special, besides its construction?

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#abstract-algebra #permutations #groupoids
35
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Continuity of Norm of Regular Representations on Étale Groupoids

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#operator-algebras #c-star-algebras #groupoids
189
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Categorical Intuition of Path Induction

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#soft-question #higher-category-theory #homotopy-type-theory #groupoids
110
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The monoidal structure on the fundamental groupoids of spectrum

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#algebraic-topology #category-theory #homotopy-theory #groupoids #spectra
103
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Obtaining $\mathscr{B}G$ from the topological groupoid $BG$; which notion of "nerve" of a topological groupoid/category should be used?

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#algebraic-topology #topological-groups #principal-bundles #classifying-spaces #groupoids
82
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Name for the group generated by a groupoid

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#group-theory #groupoids
46
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Proving a group like object always has a unique right inverse, and a unique left inverse

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#abstract-algebra #group-theory #groupoids
105
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How to prove that a unique inverse exists for every element of this group like structure

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#abstract-algebra #group-theory #groupoids
102
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Groupoid embedding into a group

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#group-theory #groupoids
231
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Why, conceptually, isn't the 2-category of connected groupoids equivalent to the 2-category of groups?

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#category-theory #soft-question #intuition #equivalence-relations #groupoids
69
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What is a pointed connected groupoid?

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#category-theory #terminology #groupoids
70
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Why is groupoids the appropriate tool for studying quasicrystals?

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#symmetry #groupoids #crystallography
142
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Understanding the "fundamental theorem of covering spaces"

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#algebraic-topology #category-theory #covering-spaces #groupoids

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