| ##### 7.5.3.0. PBW_eqDeg Procedure from library `central.lib` (see central_lib). Usage: PBW_eqDeg(Deg); Deg int Purpose: Compute PBW elements of a given degree. Return: ideal consisting of found elements. Note: Unit is omitted. Weights are ignored! Example:
    LIB "central.lib";
    ring AA = 0,(e,f,h),dp;
    matrix D[3][3]=0;
    D[1,2]=-h;  D[1,3]=2*e;  D[2,3]=-2*f;
    def A = nc_algebra(1,D); setring A; // this algebra is U(sl_2)
    // PBW Basis of A_2 \ A_1 - monomials of degree == 2:
    PBW_eqDeg( 2 );
    ==> _[1]=h2
    ==> _[2]=fh
    ==> _[3]=f2
    ==> _[4]=eh
    ==> _[5]=ef
    ==> _[6]=e2

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