Definition:Odd Permutation

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Definition

Let $n \in \N$ be a natural number.

Let $S_n$ denote the symmetric group on $n$ letters.

Let $\rho \in S_n$ be a permutation in $S_n$.

Definition 1

$\rho$ is an odd permutation if and only if $\rho$ is equivalent to an odd number of transpositions.


Definition 2

$\rho$ is an odd permutation if and only if:

$\map \sgn \rho = -1$

where $\sgn$ denotes the sign function.


Also see

  • Results about odd permutations can be found here.