Question

Is there any algebraic structure on Dyck words of length $2n$ or full binary trees of $n+1$ leaves?

score 152 · Answer 1 · 2026-03-25 21:54:11

152

Views

Is there any algebraic structure on Dyck words of length $2n$ or full binary trees of $n+1$ leaves?

Published on 25 Mar 2026 - 21:54

score 52 · Answer 2 · 2026-03-22 07:38:51

52

Views

Applications of words?

Published on 22 Mar 2026 - 7:38

score 310 · Answer 3 · 2026-03-21 23:10:22

310

Views

Is it true that the set of all 0-1 sequence with no two consecutive 1 is uncountable

Published on 21 Mar 2026 - 23:10

score 3.4k · Answer 4 · 2026-03-22 08:17:50

3.4k

Views

How many ways are there to pick a sequence of two different letters of the alphabet from the word MATHEMATICS?

Published on 22 Mar 2026 - 8:17

score 131 · Answer 5 · 2026-03-22 14:24:18

131

Views

Password combinatorics on identical notes

Published on 22 Mar 2026 - 14:24

score 551 · Answer 6 · 2026-03-22 09:33:48

551

Views

Classification of Christoffel words

Published on 22 Mar 2026 - 9:33

score 47 · Answer 7 · 2026-03-22 14:02:27

47

Views

Is it possible to define a metric in a "formula space"?

Published on 22 Mar 2026 - 14:02

score 377 · Answer 8 · 2026-03-22 06:24:50

377

Views

What is the permutation of words a-z created with the pattern: cvcvcv where c = a consonant and v = vowel?

Published on 22 Mar 2026 - 6:24

score 91 · Answer 9 · 2026-03-21 21:41:53

91

Views

What is the number of size 3 subsets of vertices of an n-dimensional hypercube such that the 3 vertices are pairwise a distance d apart?

Published on 21 Mar 2026 - 21:41

score 57 · Answer 10 · 2026-03-21 17:21:09

57

Views

Is there any way to simplify $\sum_{i=0}^n \binom{x}{i} \binom{y}{i + 1}$?

Published on 21 Mar 2026 - 17:21

score 96 · Answer 11 · 2026-03-26 12:36:32

96

Views

Is there standard terminology/notation for the "prefix" of a word?

Published on 26 Mar 2026 - 12:36

score 2.2k · Answer 12 · 2026-03-22 12:08:40

2.2k

Views

How many possible passwords of a four digit length contain at least one uppercase character and at least one number?

Published on 22 Mar 2026 - 12:08

score 61 · Answer 13 · 2023-02-06 15:00:05

61

Views

Number of strings that are made of $3$ 'a', $1$ 'b', $2$ 'c' and $2$ 'd' such that $aaa$ does not appear

Published on 06 Feb 2023 - 15:00

score 57 · Answer 14 · 2023-02-12 16:20:23

57

Views

Number of possibilities for creating words of length four

Published on 12 Feb 2023 - 16:20

score 100 · Answer 15 · 2023-02-15 12:42:17

100

Views

Aperiodic Tilings and Squarefree Words

Published on 15 Feb 2023 - 12:42

List Question

Is there any algebraic structure on Dyck words of length $2n$ or full binary trees of $n+1$ leaves?

Applications of words?

Is it true that the set of all 0-1 sequence with no two consecutive 1 is uncountable

How many ways are there to pick a sequence of two different letters of the alphabet from the word MATHEMATICS?

Password combinatorics on identical notes

Classification of Christoffel words

Is it possible to define a metric in a "formula space"?

What is the permutation of words a-z created with the pattern: cvcvcv where c = a consonant and v = vowel?

What is the number of size 3 subsets of vertices of an n-dimensional hypercube such that the 3 vertices are pairwise a distance d apart?

Is there any way to simplify $\sum_{i=0}^n \binom{x}{i} \binom{y}{i + 1}$?

Is there standard terminology/notation for the "prefix" of a word?

How many possible passwords of a four digit length contain at least one uppercase character and at least one number?

Number of strings that are made of $3$ 'a', $1$ 'b', $2$ 'c' and $2$ 'd' such that $aaa$ does not appear

Number of possibilities for creating words of length four

Aperiodic Tilings and Squarefree Words

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