| #### D.6.4.11 A_L Procedure from library `classify.lib` (see classify_lib). Usage: A_L(f); f poly A_L(s); s string, the name of the singularity Compute: the normal form of f in Arnold's list of singularities in case 1, in case 2 nothing has to be computed. Return: A_L(f): compute via 'milnorcode' the class of f and return the normal form of f found in the database. A_L("name"): get the normal form from the database for the singularity given by its name. Example:
    LIB "classify.lib";
    ring r=0,(a,b,c),ds;
    poly f=A_L("E[13]");
    f;
    ==> c2+a3+ab5+b8
    A_L(f);
    ==> Singularity R-equivalent to :  E[6k+1]=E[13]
    ==> normal form : c2+a3+ab5+b8
    ==> c2+a3+ab5+b8

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