• finding inverse permutations as arrays

    From abdelmamarwa@gmail.com@21:1/5 to All on Mon Feb 5 04:58:26 2018
    Le mardi 10 mars 2009 17:10:26 UTC+1, moro a écrit :
    If we represent a permutation of the integers 1...n as list L (or
    word) say w=2431 then L=[2,4,3,1]. Is there a built-in command to find
    the inverse of the permutation as a list. w^{-1}= 4132 or L=[4,1,3,2]
    i.e. find the position in the list where j appears?

    Thanks,

    Alejandro Morales

    can I find an algorithm in maple to find the set of involution defined by I (n): = {L in S_n such that L ^ (- 1) = L} ie for example I (2) = {L in S_2 / L ^ (- 1) = L} = {{1,2}, {2,1}}.
    thanks,
    Marwa abdelamksoud.

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