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D.3.2.18 spnf

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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