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15
163
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Foliations and groupoids in algebraic geometry

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#algebraic-geometry #schemes #groupoids #foliations
166
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Are there examples of unital and nuclear $C^*$-algebras satisfying the UCT that are not groupoid algebras of an amenable etale groupoid?

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#operator-algebras #k-theory #groupoids
338
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The étale topos of a scheme is the classifying topos of...?

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#algebraic-geometry #algebraic-topology #topos-theory #groupoids
426
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Higher homotopy groups in terms of the fundamental groupoid

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#category-theory #homotopy-theory #higher-category-theory #groupoids #higher-homotopy-groups
78
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Understanding the monadicity of groupoids over splittings

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#category-theory #groupoids #monads
283
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Morita-equivalence of groupoids and classifying topoi: correct definition

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#category-theory #topos-theory #groupoids
170
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All sheaves in a Grothendieck topos are generated by subobjects of powers of a suitable sheaf

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#category-theory #topos-theory #groupoids
339
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"Eilenberg-MacLane property" for the classifying space of a groupoid

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#algebraic-topology #homotopy-theory #classifying-spaces #groupoids
77
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Definition of $\pi_0 p^{-1}(u)$

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#algebraic-topology #definition #groupoids
426
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Equivalence of Categories between the Fundamental Group and Groupoid

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#algebraic-topology #fundamental-groups #groupoids
76
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Can we see FdHlb as a 2Category of groupoids?

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#category-theory #quantum-mechanics #groupoids #2-categories
114
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Is there a simplicial set classifying subobjects of groupoids?

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#category-theory #simplicial-stuff #higher-category-theory #groupoids
68
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The $\mathbb{C}$ vector space monad on the 2-Category of Groupoids

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#vector-spaces #category-theory #groupoids #monads
226
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The Whitehead product and $\pi_{\leq 3} S^2$

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#algebraic-topology #category-theory #homotopy-theory #higher-category-theory #groupoids
223
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Is every topological groupoid equivalent to a disjoint union of topological groups?

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#category-theory #topological-groups #groupoids

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