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15
157
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Proving the fact "cardinality of a basis of free Abelian group is unique"

Published on
#abstract-algebra #set-theory
153
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Absolute formulas with high complexity

Published on
#logic #set-theory
144
Views

Proving that Set category has exponential object

Published on
#category-theory #set-theory #topos-theory
60
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It is true that the criterio of comparation of sets is equivalent to Axiom choice?

Published on
#set-theory #cardinals #axiom-of-choice #ordinals
117
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Do I understand the continuum hypothesis correctly?

Published on
#set-theory #cardinals
1.1k
Views

Is a topological space considered to be a class in set theory?

Published on
#general-topology #set-theory
112
Views

Showing that the property of "being null" is arithmetical.

Published on
#set-theory #descriptive-set-theory
247
Views

The first uncountable ordinal and some stationary sets

Published on
#set-theory #ordinals #large-cardinals
323
Views

Is cardinality continuous?

Published on
#set-theory #cardinals
583
Views

Countable order-dense subset in a linear order

Published on
#general-topology #reference-request #set-theory #order-theory #ordinals
83
Views

Is there a set which cannot be proven to be finite or infinite

Published on
#set-theory
408
Views

Examples of sets which are not obviously sets

Published on
#set-theory #equivalence-relations #big-list
276
Views

Yet another question about non-ZFC models of ZFC.

Published on
#set-theory #model-theory #axioms
100
Views

For any random real $x$ there are infinitely many $a$ such that $x(a) = k$

Published on
#proof-verification #set-theory #forcing
135
Views

Prove that set is stationary.

Published on
#set-theory #cardinals

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