List questions from combinatorial-designs

Published on 16 Dec 2014 - 12:47

95

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partitions of finite set in same-size parts having at most one element in common

Published on 28 Dec 2014 - 20:50

206

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Symmetrical combinatoral block design

Published on 28 Oct 2019 - 16:17

700

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How many tickets should Paul buy?

Published on 23 Feb 2026 - 8:38

31

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Fixtures for doubles pétanque league

Published on 16 Dec 2019 - 11:26

68

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How can I construct a $(v,\Bbb{N}_{\geq 6},1)$ pairwise balanced design?

Published on 01 Jan 2020 - 1:15

834

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Constructing a Steiner Triple System

Published on 07 Jan 2020 - 23:15

52

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Combinatorial optimization - blocks & subsets

Published on 21 Jan 2020 - 19:18

97

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Cartesian product of two Steiner Triple Systems is a Steiner Triple system

Published on 05 Feb 2020 - 23:15

60

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Small question regarding Hadamard matrix of order $4m$

Published on 19 Mar 2026 - 21:06

149

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Show that there is no non-trivial solution for $x^2 + 2z^2 = 10y^2$

Published on 08 Feb 2020 - 6:27

360

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How do you find a $(21,5,1)$-difference set in $(\mathbb{Z}_{21}, +)$?

Published on 25 Mar 2026 - 6:00

140

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Show that any $n \times n$ array based on $\{1,2,..,n\}$ is a Latin Square if and only if it is simultaneously orthogonal to R and C.

Published on 15 Mar 2020 - 12:11

262

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The least average number of Corona virus tests

Published on 21 Mar 2020 - 2:10

120

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Filling an $8\times 8$ grid with the numbers $1$ to $64$ such that every $3\times 3$ subsquare has a sum less than $256$

Published on 21 Mar 2020 - 13:32

List Question

Building a 3D matrix of positive integers

partitions of finite set in same-size parts having at most one element in common

Symmetrical combinatoral block design

How many tickets should Paul buy?

Fixtures for doubles pétanque league

How can I construct a $(v,\Bbb{N}_{\geq 6},1)$ pairwise balanced design?

Constructing a Steiner Triple System

Combinatorial optimization - blocks & subsets

Cartesian product of two Steiner Triple Systems is a Steiner Triple system

Small question regarding Hadamard matrix of order $4m$

Show that there is no non-trivial solution for $x^2 + 2z^2 = 10y^2$

How do you find a $(21,5,1)$-difference set in $(\mathbb{Z}_{21}, +)$?

Show that any $n \times n$ array based on $\{1,2,..,n\}$ is a Latin Square if and only if it is simultaneously orthogonal to R and C.

The least average number of Corona virus tests

Filling an $8\times 8$ grid with the numbers $1$ to $64$ such that every $3\times 3$ subsquare has a sum less than $256$

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