Is that the same as the sign of the permutation (SignPerm ... Hm, yep, I guess so)? You may want to check out GAP (or sage which includes GAP). Perl is great, but sometimes it is helpful to have a system where a permutation is a native object. :)

Good Day,
    Dean

In reply to Re: sort function and parity of the permutation. by duelafn
in thread sort function and parity of the permutation. by latejita

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