List questions from combinatorics-on-words

Published on 12 May 2022 - 11:37

102

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Counting permutations with inclusion-exclusion

Published on 10 Jun 2022 - 1:06

48

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How many words can we make with the following letters $PTEXYPADFYOLNQYIG$?

Published on 16 Jun 2022 - 1:22

72

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Is word substitution invertible?

Published on 24 Jun 2022 - 13:19

244

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Sequence of $0$’s and $1$’s without six consecutive identical blocks

Published on 02 Jul 2022 - 15:54

384

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Normal subgroup generated by one element

Published on 28 Mar 2026 - 2:09

191

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Word length function on subgroup

Published on 19 Jul 2022 - 8:54

77

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How many different ways can you write $u^5v^2$?

Published on 26 Mar 2026 - 3:00

162

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Can we define addition of numbers which are NOT eventually all zero as we go to the left?

Published on 21 Aug 2022 - 1:27

145

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Number of strings containing an adjacent pair of a specific character

Published on 24 Aug 2022 - 20:07

715

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Find the number of words that can be made by all of the letters in the word 'GEOMETRY' so that no vowels are adjacent.

Published on 27 Aug 2022 - 11:36

82

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How many subsequences do you need to look for to infer a word?

Published on 08 Sep 2022 - 16:09

57

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• How many ”special” words are in $S$

Published on 19 Sep 2022 - 21:25

65

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Proving an equation for the number of "sentences" using $k$ letters

Published on 01 Oct 2022 - 10:49

155

Views

Find all strings containing {A, B, C} with length 3 and don't have AB, BC, or CA as a substring.

Published on 09 Oct 2022 - 1:06

List Question

Recursive relation practice

Counting permutations with inclusion-exclusion

How many words can we make with the following letters $PTEXYPADFYOLNQYIG$?

Is word substitution invertible?

Sequence of $0$’s and $1$’s without six consecutive identical blocks

Normal subgroup generated by one element

Word length function on subgroup

How many different ways can you write $u^5v^2$?

Can we define addition of numbers which are NOT eventually all zero as we go to the left?

Number of strings containing an adjacent pair of a specific character

Find the number of words that can be made by all of the letters in the word 'GEOMETRY' so that no vowels are adjacent.

How many subsequences do you need to look for to infer a word?

• How many ”special” words are in $S$

Proving an equation for the number of "sentences" using $k$ letters

Find all strings containing {A, B, C} with length 3 and don't have AB, BC, or CA as a substring.

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