20.11 MappingPermListList

MappingPermListList( list1, list2 )

MappingPermListList returns a permutation perm such that list1[i] ^ perm = list2[i]. perm fixes all points larger then the maximum of the entries in list1 and list2. If there are several such permutations, it is not specified which MappingPermListList returns. list1 and list2 must be lists of positive integers of the same length, and neither may contain an element twice.

    gap> MappingPermListList( [3,4], [6,9] );
    (3,6,4,9,8,7,5)
    gap> MappingPermListList( [], [] );
    () 

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