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15
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Handshake/pigeonhole principle problem?

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#combinatorics #graph-theory #combinatorial-designs
510
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$n$-element subsets of the set $\{1,2, ..., 2n\}$.

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#combinatorics #binomial-coefficients #combinatorial-designs
51
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Show that any pair of vectors jointly lies in the same number of subspaces

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#vector-spaces #finite-fields #combinatorial-designs
75
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k-subsets with some pair containing every element

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#combinatorics #extremal-combinatorics #combinatorial-designs
1k
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Union of sets with pairwise intersection having half of the elements

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#combinatorics #elementary-set-theory #combinatorial-designs
1.2k
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4-cycle decomposition of a complete graph

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#combinatorics #graph-theory #combinatorial-designs
699
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How many latin-square designs are orthogonal to this 4x4 latin square design?

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#matrices #puzzle #combinatorial-designs #latin-square #sudoku
66
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Doubt in a paper on combinatorial designs

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#combinatorics #combinatorial-designs
278
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Subsets of equal size, where each element appears an equal number of times

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#combinatorics #combinatorial-designs
663
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Trying to Solve Math Problem for Real World Use - Combinatorics

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#combinatorics #combinatorial-designs
2.7k
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Tournament bracket for a 4-players game

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#combinatorics #graph-theory #algebraic-graph-theory #combinatorial-designs
303
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Subsets of a set with common elements between themselves

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#combinatorics #extremal-combinatorics #combinatorial-designs
221
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Count the number of sets of subsets of (Steiner?) triples

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#combinatorics #algebraic-graph-theory #combinatorial-designs
161
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Does Steiner system S(2,11, 1331) exist?

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#algebraic-topology #combinatorial-designs
78
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Generating rotating groups for a seminar

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#combinatorics #recreational-mathematics #puzzle #combinatorial-designs

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