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What does it exactly mean if a morphism of sheaves is surjective?

algebraic-geometry sheaf-theory asked Oct 16, 2016 at 3:17

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Does the existence of a derived functor imply existence of model structure?

ag.algebraic-geometry ct.category-theory model-categories asked Feb 6, 2017 at 6:05

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Are there any intersections between Theory A and Theory B?

terminology ho.history-overview research-practice asked Jul 12, 2019 at 10:08

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Is today’s European Union more or less integrated than the United States under the Articles of Confederation?

united-states european-union constitution asked Feb 13, 2020 at 19:14

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A collection of sets that cover all edges in Kn?

combinatorics graph-theory combinatorial-proofs algebraic-combinatorics asked Jan 1, 2020 at 8:45

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How is the bill blocking the no-deal Brexit useful?

united-kingdom european-union brexit europe asked Sep 4, 2019 at 18:10

politics.stackexchange.com

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