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15
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Shelah notation

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#logic #set-theory #predicate-logic #model-theory
165
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Banach-Tarski nonparadox: Reassembling a ball into two balls with a total volume equal to the original volume

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#measure-theory #set-theory #axiom-of-choice
387
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Particular union of well ordered sets that is well ordered

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#set-theory #order-theory
68
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Subsets of the unit interval

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#set-theory #order-theory
70
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ZFC - Prove existence of set {A_1, A_2, A_3, ...}

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#set-theory #axioms
268
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Why do the hereditarily finite sets model ZF-Infinity, if we need Infinity to talk about them?

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#logic #set-theory #axioms
59
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Functorial comparison of Different Models of Set Theory

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#reference-request #category-theory #set-theory #model-theory #topos-theory
153
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Can the union of a set of ordinals be an element of the set?

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#set-theory
94
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Finding canonical names for equivalence classes

Published on
#set-theory #forcing
186
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Formally representing "arbitrarily large" as a distinct entity from "countably infinite"

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#set-theory #cardinals
295
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When to use Iterated Forcing

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#set-theory #forcing
304
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Well-ordered sets are order-isomorphic to a unique ordinal and proof by induction over the ordinals

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#proof-verification #set-theory #ordinals
106
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A question about a lemma in Kenneth Kunen's article "Some points in $\beta \mathbb{N}$."

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#measure-theory #set-theory #proof-explanation #boolean-algebra
628
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Subset of reals with cardinality $\aleph_1$

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#set-theory
34
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On algebra-valued models for set theory

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#set-theory

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