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| ### Function HadamardInvariant ( elt-alg^mat H ) -> seq() ### Description Given a Hadamard matrix H, returns a sequence of integers shared by all Hadamard matrices equivalent to H (and some others). ### Examples x_H:= Matrix(Z,4,4,[1,1,1,1,-1,1,-1,1,-1,-1,1,1,1,-1,-1,1]); HadamardInvariant(x_H);
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