List questions from combinatorial-designs

Published on 13 Apr 2026 - 23:58

592

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On non-isomorphic and isomorphic Steiner Triple System!

Published on 16 Apr 2026 - 0:16

80

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Groups of a specific order from a difference set.

Published on 10 May 2026 - 18:42

621

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Designing a Hadamard matrix design of order 12 using Algebra methods

Published on 17 Apr 2026 - 6:14

508

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What is the operation of quasigroup in this example?

Published on 11 May 2026 - 0:33

118

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Partitions with pairwise small intersection

Published on 12 Apr 2026 - 12:16

118

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Set of integers with unique differences

Published on 10 May 2026 - 18:42

44

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Is there an (11,3,3)-BIBD with specific conditions?

Published on 17 Apr 2026 - 6:57

72

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Some questions about resolvable group divisible designs

Published on 14 Apr 2026 - 6:03

47

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Why can't these $STS(9)$'s have 8 blocks in common?

Published on 16 Apr 2026 - 10:10

79

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Table Tennis Player Grouping Problem

Published on 13 Apr 2026 - 21:21

331

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Let $S_1, S_2, \dots , S_m$ be distinct subsets of $\{1, 2, \dots , n\}$ such that $|S_i \cap S_j | = 1$ for all $i \ne j$. Prove that $m \le n$.

Published on 16 Apr 2026 - 12:32

87

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A family of subsets each of size $r$ must witness decent size of intersection for some two members.

Published on 15 Apr 2026 - 7:02

80

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Existence of a Hadamard-like matrix

Published on 14 Apr 2026 - 19:07

149

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Minimizing the diagonal product of a special orthogonal matrix

Published on 15 Apr 2026 - 7:15

List Question

Does the projective closure of an affine plane of order $n$ also have order $n$?

On non-isomorphic and isomorphic Steiner Triple System!

Groups of a specific order from a difference set.

Designing a Hadamard matrix design of order 12 using Algebra methods

What is the operation of quasigroup in this example?

Partitions with pairwise small intersection

Set of integers with unique differences

Is there an (11,3,3)-BIBD with specific conditions?

Some questions about resolvable group divisible designs

Why can't these $STS(9)$'s have 8 blocks in common?

Table Tennis Player Grouping Problem

Let $S_1, S_2, \dots , S_m$ be distinct subsets of $\{1, 2, \dots , n\}$ such that $|S_i \cap S_j | = 1$ for all $i \ne j$. Prove that $m \le n$.

A family of subsets each of size $r$ must witness decent size of intersection for some two members.

Existence of a Hadamard-like matrix

Minimizing the diagonal product of a special orthogonal matrix

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