List questions from order-theory

Published on 08 Jun 2020 - 8:48

142

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Hessenberg power of ordinals (redux)

Published on 26 Mar 2026 - 12:48

68

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If $X_i$ has supremum for any $i=1,...,n$ then $\sup\bigcup X_i=\max\{\sup X_i\}$.

Published on 10 Jun 2020 - 22:14

193

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Hausdorff Maximal Principle implies Well-Ordering Theorem

Published on 26 Mar 2026 - 12:43

282

Views

Chain that doesn't contain maximal element?

Published on 11 Jun 2020 - 22:39

138

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Non-emptyness of projective limit over countable set

Published on 12 Jun 2020 - 9:46

78

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Inductive set, maximal elements and upper bounds

Published on 12 Jun 2020 - 23:02

257

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Understanding the steps in Pugh's proof about the Least Upper Bound Property

Published on 13 Jun 2020 - 6:48

37

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A question on order-isomorphism with $\mathbb N$.

Published on 26 Mar 2026 - 12:43

43

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Characters on inverse semigroups: Hahn-Banach?

Published on 26 Mar 2026 - 8:02

288

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Decomposition of $2^{[n]}$ into $\binom{n}{n/2}$ chains

Published on 23 Feb 2026 - 2:39

466

Views

Embedding of countable linear orders into $\Bbb Q$ as topological spaces

Published on 16 Jun 2020 - 19:43

189

Views

Relaxed Loewner-order inequalities for matrix modulus

Published on 26 Mar 2026 - 19:15

39

Views

Relations and partial with some set A and a relation R b|d

Published on 01 Apr 2026 - 3:11

134

Views

Is there a natural way to totally order the set of unlabeled binary trees on $n$ nodes?

Published on 19 Jun 2020 - 11:45

List Question

Prove that for k, the number of elements with prime order p, k = -1 (mod p)

Hessenberg power of ordinals (redux)

If $X_i$ has supremum for any $i=1,...,n$ then $\sup\bigcup X_i=\max\{\sup X_i\}$.

Hausdorff Maximal Principle implies Well-Ordering Theorem

Chain that doesn't contain maximal element?

Non-emptyness of projective limit over countable set

Inductive set, maximal elements and upper bounds

Understanding the steps in Pugh's proof about the Least Upper Bound Property

A question on order-isomorphism with $\mathbb N$.

Characters on inverse semigroups: Hahn-Banach?

Decomposition of $2^{[n]}$ into $\binom{n}{n/2}$ chains

Embedding of countable linear orders into $\Bbb Q$ as topological spaces

Relaxed Loewner-order inequalities for matrix modulus

Relations and partial with some set A and a relation R b|d

Is there a natural way to totally order the set of unlabeled binary trees on $n$ nodes?

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