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Permutation category information


In mathematics, the permutation category[1] is a category where

  1. the objects are the natural numbers,
  2. the morphisms from a natural number n to itself are the elements of the symmetric group and
  3. there are no morphisms from m to n if .

It is equivalent as a category to the category of finite sets and bijections between them.

  1. ^ Trimble n.d., § 1

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Permutation category

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irreducible representation can in fact be realized over the integers (every permutation acting by a matrix with integer coefficients); it can be explicitly constructed...

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Isomorphism

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odd/even permutation property of the ghost leg. An odd number of legs represents an odd permutation, and an even number of legs gives an even permutation. It...

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group imply that ρ(g) is a bijection (or permutation) for all g in G. Thus we may equivalently define a permutation representation to be a group homomorphism...

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DES supplementary material

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1 is always the most significant bit. This table specifies the input permutation on a 64-bit block. The meaning is as follows: the first bit of the output...

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are a permutation of the set {1,...,n}. The permutation i′ is selected randomly, with equal probabilities placed on all n! possible permutations. This...

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bijective function from a set to itself is also called a permutation, and the set of all permutations of a set forms its symmetric group. Some bijections with...

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