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check_zero_matrix

synopsis: INT check_zero_matrix (OP mat, OP p_root)

description:

Checks that the matrix is zero. If p_root=0, then the matrix is checked for general q. Otherwise it is checked for q a primitive p_root of unity. If there is no ERROR, returns 0 if zero for all q, 1 if zero at primitive p_root of unity, 2 if non-zero.

return:

ERROR, 0, 1, or 2 as described above.


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