Question

Disjointness in definition of sum of linear orders when talking about ordinals

score 89 · Answer 1 · 2026-04-12 15:48:34

89

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Disjointness in definition of sum of linear orders when talking about ordinals

Published on 12 Apr 2026 - 15:48

score 60 · Answer 2 · 2026-03-25 21:22:53

60

Views

Meaning of $\phi(.;.)$` in $\sum_{j=1}^n \phi(j; [1, min\{m, j\}])$

Published on 25 Mar 2026 - 21:22

score 214 · Answer 3 · 2026-04-14 01:40:58

214

Views

Let the poset $P$ be the set of all LI subsets of a vector space. Why any union $\bigcup T$ of totally ordered LI subsets T is still LI?

Published on 14 Apr 2026 - 1:40

score 569 · Answer 4 · 2026-04-10 00:37:02

569

Views

Is the product topology of scott topologies a scott topology?

Published on 10 Apr 2026 - 0:37

score 370 · Answer 5 · 2026-04-15 19:45:25

370

Views

Filters/ ultrafilters/ principal filters/ proper filters/ maximal filters - intuition and relations between them

Published on 15 Apr 2026 - 19:45

score 92 · Answer 6 · 2026-04-16 05:16:50

92

Views

Ordered field: If $a>0$, $b>0$, $c>0$, $d>0$, $a<b$, $d<c$, do we have $ad<bc$?

Published on 16 Apr 2026 - 5:16

score 318 · Answer 7 · 2026-04-10 02:26:08

318

Views

What is a z-filter?

Published on 10 Apr 2026 - 2:26

score 323 · Answer 8 · 2026-04-14 14:00:57

323

Views

Why are complete lattices non-empty?

Published on 14 Apr 2026 - 14:00

score 24 · Answer 9 · 2026-04-14 22:13:16

24

Views

How many ways can an $n$-length string containing $k$ groups be ordered s.t. no adjacent same-group objects occur?

Published on 14 Apr 2026 - 22:13

score 238 · Answer 10 · 2026-04-15 13:09:34

238

Views

$\mathbb{R}^n$ has no order compatible with addition

Published on 15 Apr 2026 - 13:09

score 125 · Answer 11 · 2026-04-11 22:32:57

125

Views

Why are algebraic structures typically defined with operators/relations and laws?

Published on 11 Apr 2026 - 22:32

score 400 · Answer 12 · 2026-04-13 07:50:05

400

Views

A general "inclusion-exclusion principle" / Formulas like $\inf(a,b)\sup(a,b)=ab$

Published on 13 Apr 2026 - 7:50

score 58 · Answer 13 · 2026-04-14 21:35:21

58

Views

Find order-preserving bijection between two sets

Published on 14 Apr 2026 - 21:35

score 34 · Answer 14 · 2026-04-14 18:39:16

34

Views

Name for posets satisfying Zorn's lemma

Published on 14 Apr 2026 - 18:39

score 86 · Answer 15 · 2026-04-14 07:20:38

86

Views

Definition initial segment, chain and cut

Published on 14 Apr 2026 - 7:20

List Question

Disjointness in definition of sum of linear orders when talking about ordinals

Meaning of $\phi(.;.)$` in $\sum_{j=1}^n \phi(j; [1, min\{m, j\}])$

Let the poset $P$ be the set of all LI subsets of a vector space. Why any union $\bigcup T$ of totally ordered LI subsets T is still LI?

Is the product topology of scott topologies a scott topology?

Filters/ ultrafilters/ principal filters/ proper filters/ maximal filters - intuition and relations between them

Ordered field: If $a>0$, $b>0$, $c>0$, $d>0$, $a<b$, $d<c$, do we have $ad<bc$?

What is a z-filter?

Why are complete lattices non-empty?

How many ways can an $n$-length string containing $k$ groups be ordered s.t. no adjacent same-group objects occur?

$\mathbb{R}^n$ has no order compatible with addition

Why are algebraic structures typically defined with operators/relations and laws?

A general "inclusion-exclusion principle" / Formulas like $\inf(a,b)\sup(a,b)=ab$

Find order-preserving bijection between two sets

Name for posets satisfying Zorn's lemma

Definition initial segment, chain and cut

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