Singular Manual: Ann

| #### D.4.21.1 Ann Procedure from library `primdec.lib` (see primdec_lib). Usage: Ann(M); M module Return: ideal, the annihilator of coker(M) Note: The output is the ideal of all elements a of the basering R such that a * R^m is contained in M (m=number of rows of M). Example:
    LIB "primdec.lib";
    ring  r = 0,(x,y,z),lp;
    module M = x2-y2,z3;
    Ann(M);
    ==> _[1]=z3
    ==> _[2]=x2-y2
    M = [1,x2],[y,x];
    Ann(M);
    ==> _[1]=x2y-x
    qring Q=std(xy-1);
    module M=imap(r,M);
    Ann(M);
    ==> _[1]=0

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