| #### D.3.2.20 spnf Procedure from library `linalg.lib` (see linalg_lib). Usage: spnf(list(a[,m])); ideal a, intvec m Assume: ncols(a)==size(m) Return: list l: l[1] an ideal, the generators of a; sorted and with multiple entries displayed only once l[2] an intvec, l[2][i] provides the multiplicity of l[1][i] Example:
    LIB "linalg.lib";
    ring R=0,(x,y),ds;
    list sp=list(ideal(-1/2,-3/10,-3/10,-1/10,-1/10,0,1/10,1/10,3/10,3/10,1/2));
    spprint(spnf(sp));
    ==> (-1/2,1),(-3/10,2),(-1/10,2),(0,1),(1/10,2),(3/10,2),(1/2,1)

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