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Results tagged with co.combinatorics
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user 42059
Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.
14
votes
Structures that turn out to exhibit a symmetry even though their definition doesn't
From school days... Take positive reals x,y,z,w. The following statement
is actually symmetric in x,y,z,w:
"there exists an equilateral triangle of side length w,
and a point whose distances from t …