Procedure from library linalg.lib (see linalg_lib).
Assume:
ncols(e)==size(m)==size(V); typeof(V[i])=="int"
Return:
list sp; spectrum normal form of (e,m,V)
ideal sp[1]; numbers in e in increasing order
intvec sp[2];
int sp[2][i]; multiplicity of number sp[1][i] in e
list sp[3];
module sp[3][i]; module associated to number sp[1][i]
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