KASH3 Ref - SignPerm

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| ### Function SignPerm ( elt-grp^per P ) -> elt-ord^rat ### Description 'SignPerm' returns the sign of the permutation 'P'. The sign is '+1' if 'P' is the product of an even number of transpositions, and '-1' if 'P' is the product of an odd number of transpositions. The sign is a homomorphism from the symmetric group onto the multiplicative group '{+1, -1}', the kernel of which is the alternating group.
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