| #### D.15.14.16 imageLattice Procedure from library `multigrading.lib` (see multigrading_lib). Usage: imageLattice(Q,L); Q and L are of type intmat Purpose: compute an integral basis for the image of the lattice L under the homomorphism of lattices Q. Return: intmat Example:
    LIB "multigrading.lib";
    intmat Q[2][3] =
    1,2,3,
    3,2,1;
    intmat L[3][2] =
    1,4,
    2,5,
    3,6;
    // should be a 2x2 matrix with columns
    // [2,-14], [0,36]
    imageLattice(Q,L);
    ==> 2,0,
    ==> 22,36

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