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How to prove $X$ is normal?

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#general-topology #ordinals
305
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Omega, well ordering and the cumulative hierarchy $V$.

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#set-theory #ordinals
39
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Is the space $X$ in the class dual to the spaces with the Souslin property?

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#general-topology #ordinals
1.3k
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When does ordinal addition/multiplication commute?

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#set-theory #ordinals
233
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Soft Question: Scientific applications of ordinal arithmetic?

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#soft-question #ordinals
196
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Ordinals Addition Property

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#set-theory #ordinals
710
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How many positive numbers need to be added together to ensure that the sum is infinite?

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#sequences-and-series #set-theory #ordinals
840
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What are some good open problems about countable ordinals?

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#soft-question #set-theory #ordinals #infinitary-combinatorics
102
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If $cf(\kappa)=\lambda$, then is every sequence of length $\lambda$ cofinal in $\kappa$?

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#elementary-set-theory #cardinals #ordinals
192
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Another question about Cohen's article

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#set-theory #ordinals
653
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Transfinite sequence

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#ordinals
1.2k
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Diagonal intersection of club sets

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#set-theory #ordinals #infinitary-combinatorics
1.1k
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Confusion about cofinality

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#reference-request #elementary-set-theory #cardinals #ordinals
115
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Nimber of selective compound games

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#discrete-mathematics #reference-request #ordinals #combinatorial-game-theory
421
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Can we embed the ordinal and cardinal number systems into larger, more convenient systems of arithmetic?

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#abstract-algebra #cardinals #ordinals #number-systems

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