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If $C$ is a nonempty class of ordinals, would $\bigcap C$ be the least element of $C$?

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#set-theory #ordinals
583
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The set of natural numbers is ordinal

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#elementary-set-theory #ordinals
295
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Limit ordinal properties

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#set-theory #ordinals
189
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Countable ordinals property

Published on
#set-theory #order-theory #ordinals
559
Views

The von Neumann Hierarchy.

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#set-theory #ordinals
75
Views

Properties of axiom of choice

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#set-theory #axiom-of-choice #ordinals
322
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cardinal's arithmetic

Published on
#cardinals #ordinals #large-cardinals
36
Views

Ordinal properties: if $\lambda<\kappa$ then $\lambda\cap\kappa<\kappa$

Published on
#elementary-set-theory #ordinals
44
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Normal functions

Published on
#cardinals #ordinals
118
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Definition of a closed set

Published on
#cardinals #ordinals
196
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Has the proof theoretic ordinal of $MLTT + M$ been studied?

Published on
#ordinals #proof-theory #type-theory #ordinal-analysis
243
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Intersection of two clubs.

Published on
#cardinals #ordinals
182
Views

Proof of Fodor's lemma

Published on
#set-theory #cardinals #ordinals
38
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A slightly different definition of successors.

Published on
#cardinals #ordinals
305
Views

Closed and unbounded sets

Published on
#set-theory #ordinals

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