isOdd -- whether a permutation is odd

Usage:

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

Description

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

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

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

o1 : Permutation

i2 : isOdd p

o2 = true

Ways to use isOdd:

isOdd(Permutation)

For the programmer

The object isOdd is a method function.

The source of this document is in /__w/M2/M2/macaulay2-1.26.05+ds/M2/Macaulay2/packages/Permutations/Documentation/mainDocs.m2:446:0.

isOdd -- whether a permutation is odd

Description

See also

Ways to use isOdd:

For the programmer