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Building a 3D matrix of positive integers

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#combinatorics #combinatorial-designs
99
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partitions of finite set in same-size parts having at most one element in common

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#combinatorics #discrete-mathematics #algorithms #combinatorial-designs
209
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Symmetrical combinatoral block design

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#combinatorics #symmetry #combinatorial-designs
703
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How many tickets should Paul buy?

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#combinatorics #contest-math #gambling #combinatorial-designs #lotteries
33
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Fixtures for doubles pétanque league

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#combinatorics #combinatorial-designs
69
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How can I construct a $(v,\Bbb{N}_{\geq 6},1)$ pairwise balanced design?

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#combinatorics #extremal-combinatorics #combinatorial-designs
836
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Constructing a Steiner Triple System

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#combinatorics #combinatorial-designs
53
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Combinatorial optimization - blocks & subsets

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#combinatorics #combinatorial-designs
100
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Cartesian product of two Steiner Triple Systems is a Steiner Triple system

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#combinatorics #combinatorial-designs
68
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Small question regarding Hadamard matrix of order $4m$

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#combinatorial-designs #hadamard-matrices
150
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Show that there is no non-trivial solution for $x^2 + 2z^2 = 10y^2$

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#number-theory #graph-theory #combinatorial-designs
361
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How do you find a $(21,5,1)$-difference set in $(\mathbb{Z}_{21}, +)$?

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#graph-theory #combinatorial-group-theory #combinatorial-designs #difference-sets
142
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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.

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#combinatorial-designs #latin-square
263
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The least average number of Corona virus tests

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#probability #contest-math #combinatorial-designs
121
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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 $256$

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#matrices #combinatorial-designs

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