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Proving a characterisation for closed functions.

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#general-topology #set-theory
155
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Am I correct in understanding Axiom of Extension?

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#logic #set-theory #predicate-logic
508
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Ideal treatment of set theory as a meta theory for developing first-order logic

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#set-theory #first-order-logic #foundations
88
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Prove that for all $\alpha\in\textbf{On}$ the set $V_{\alpha}$ is transitive

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#set-theory
255
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Equivalent definition of ordinal sum

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#proof-writing #set-theory #ordinals
77
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The category of Sets as a colimit over compact objects

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#category-theory #set-theory #topos-theory
156
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Choquet not strong Choquet

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#general-topology #set-theory #descriptive-set-theory
52
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Lemma I.13.19 on Kunen's set theory

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#set-theory #cardinals
84
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Question about proof that there are an unbounded number of gaps in the constructible universe

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#set-theory
41
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What means a L-cardinal?

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#set-theory
1.1k
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What is a good argument for rejecting the axiom of choice?

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#set-theory #axiom-of-choice
105
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Set theory based on different logic

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#set-theory #examples-counterexamples
305
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Is every sigma-algebra of cardinality $2^\kappa$ for some cardinal $\kappa$?

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#measure-theory #set-theory
119
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Does second-order-arithmetic + PD proof consistency of ZFC?

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#logic #set-theory
310
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What is the importance of Zorn's lemma in Tychonoff theorem proof?

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#general-topology #set-theory

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