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15
166
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The element relation

Published on
#set-theory
178
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How strong are weak choice principles?

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#set-theory #axiom-of-choice
311
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Classes in Set Theory

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#set-theory
167
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Burali-Forti paradox for cardinals

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#set-theory #cardinals #ordinals
114
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Basic properties and intuition behind an independent family of subsets of a set.

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#general-topology #set-theory
92
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Classification theorem of topological vector bundles via presheaves

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#algebraic-topology #category-theory #set-theory #vector-bundles
82
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Can a hypercomputer solve random sequences?

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#set-theory #turing-machines #random-functions
548
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Why doesn't ZFC "know about" all of the ordinals?

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#set-theory #ordinals
164
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Do we need the Axiom of Choice to guarantee surjectiveness of projections?

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#set-theory #axiom-of-choice #projection
157
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Conservative extentions by definitions with partial existential results. It is possible?

Published on
#logic #set-theory
221
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Is every model of MK (Morse-Kelley-Set-Theory) well-founded?

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#set-theory #foundations
82
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Is it true that for any cardinal $\kappa$ that in injects into $\aleph_{\omega}$, $(\kappa)^{+}$ injects into $\aleph_{\omega}$?

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#set-theory #cardinals #ordinals
134
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Making sense of a bijection between proper classes?

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#set-theory #ordinals
256
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Giving an explicit example showing that AC is independent of ZF.

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#logic #set-theory #axiom-of-choice
67
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Suslin trees in transitive models

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#set-theory #trees

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