synopsis: INT an_sdg(OP part,perm,D)
description:computes the seminormal matrix D representing a PERMUTATION perm in the irreducible resresentation [part] of a partition part restricted to An (part has to be a VECTOR of length 2, the compnents of which are a partition and an integer 0L or 1L). 0L means, that [part]+ is concerned in case of a selfconjugate partition, and 1L indicates [part]-.
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