| #### D.6.3.8 morsesplit Procedure from library `classify.lib` (see classify_lib). Usage: morsesplit(f); f=poly Return: Normal form of f in M^3 after application of the splitting lemma Compute: apply the splitting lemma (generalized Morse lemma) to f Example:
    LIB "classify.lib";
    ring r=0,(x,y,z),ds;
    export r;
    ==> // ** `r` is already global
    init_debug(1);
    ==> Debugging level is set to  1
    poly f=(x2+3y-2z)^2+xyz-(x-y3+x2*z3)^3;
    poly g=morsesplit(f);
    ==> Residual singularity f= -x3+3/2xy2+1/2x3y-1/16x2y2+3x2y3
    g;
    ==> -x3+3/2xy2+1/2x3y-1/16x2y2+3x2y3

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