List questions from order-theory

Published on 04 May 2020 - 0:13

73

Views

Necessary and sufficient conditions for a canonical mapping $\sigma$ to be surjective in an $L$-set.

Published on 23 Feb 2026 - 7:22

69

Views

$\mathbb{Q+Z}$ not isomorphic to $\mathbb{Q+N}$

Published on 05 May 2020 - 9:30

784

Views

Proving two sets $A, B$ are order isomorphic

Published on 26 Mar 2026 - 12:43

873

Views

Notation for argsort

Published on 05 May 2020 - 15:02

237

Views

Finding a chain with no least or greatest elements for $(\mathcal{P}(\mathbb{N}),\subseteq)$

Published on 06 May 2020 - 16:01

34

Views

isomorphisms - subgroup of an specific order (prove)

Published on 08 May 2020 - 10:07

29

Views

Being $o(x)\mid o(y)$, can we say that $x$ is a recurrence of $y$ (if $x$ is the power of $y$)?

Published on 09 May 2020 - 7:43

28

Views

Partially Orders

Published on 09 May 2020 - 21:32

107

Views

Is there a characterization of which posets arise as the transitive closure of a set?

Published on 11 May 2020 - 4:36

98

Views

Well-Ordering Theorem implies Hausdorff Maximal Principle

Published on 11 May 2020 - 20:42

326

Views

Can $\mathbb{C}$ be totally ordered?

Published on 26 Mar 2026 - 12:42

121

Views

The subgroups of a cyclic group

Published on 30 Mar 2026 - 6:09

111

Views

Elements of an specific order in a non cyclic non abelian group

Published on 29 Mar 2026 - 15:15

453

Views

Big O / strict/ partial order

Published on 13 May 2020 - 9:31

List Question

Negation of monotonicity

Necessary and sufficient conditions for a canonical mapping $\sigma$ to be surjective in an $L$-set.

$\mathbb{Q+Z}$ not isomorphic to $\mathbb{Q+N}$

Proving two sets $A, B$ are order isomorphic

Notation for argsort

Finding a chain with no least or greatest elements for $(\mathcal{P}(\mathbb{N}),\subseteq)$

isomorphisms - subgroup of an specific order (prove)

Being $o(x)\mid o(y)$, can we say that $x$ is a recurrence of $y$ (if $x$ is the power of $y$)?

Partially Orders

Is there a characterization of which posets arise as the transitive closure of a set?

Well-Ordering Theorem implies Hausdorff Maximal Principle

Can $\mathbb{C}$ be totally ordered?

The subgroups of a cyclic group

Elements of an specific order in a non cyclic non abelian group

Big O / strict/ partial order

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