34.17 ElementaryDivisorsMat

ElementaryDivisorsMat( mat )

ElementaryDivisors returns a list of the elementary divisors, i.e., the unique d with d[i] divides d[i+1] and mat is equivalent to a diagonal matrix with the elements d[i] on the diagonal (see DiagonalizeMat).

    gap> m := [ [ 0, -1, 1 ], [ -2, 0, -2 ], [ 2, -2, 4 ] ];;
    gap> ElementaryDivisorsMat( m );
    [ 1, 2, 0 ] 

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