isEven -- whether a permutation is even

Usage:

isEven w
Inputs:
- w, a permutation,
Outputs:
- a Boolean value,

Description

A permutation $p$ is even if it can be written as a product of an even number of transpositions. Equivalently, a permutation is even if its sign is $1$.

i1 : p = permutation {3,1,2,5,4}

o1 = Permutation{3, 1, 2, 5, 4}

o1 : Permutation

i2 : isEven p

o2 = false

Ways to use isEven:

isEven(Permutation)

For the programmer

The object isEven is a method function.

The source of this document is in Permutations/Documentation/mainDocs.m2:420:0.

isEven -- whether a permutation is even

Description

See also

Ways to use isEven:

For the programmer