#skew_and_direct_sums_of_permutations
Skew and direct sums of permutations
In combinatorics, the skew sum and direct sum of permutations are two operations to combine shorter permutations into longer ones. Given a permutation π of length m and the permutation σ of length n, the skew sum of π and σ is the permutation of length m + n defined by
Sun 24th
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