Singular Manual: is_cenSubbimodule

| ##### 7.5.16.0. is_cenSubbimodule Procedure from library `nchomolog.lib` (see nchomolog_lib). Usage: is_cenSubbimodule(M); M module Compute: 1, if a subbimodule, generated by the columns of M is centralizing in the sense of Artin and 0 otherwise Example:
    LIB "nchomolog.lib";
    def A = makeUsl2(); setring A;
    poly p = 4*e*f + h^2-2*h; // generator of the center
    matrix M[2][2] = p, p^2-7,0,p*(p+1);
    is_cenSubbimodule(M); // M is centralizing subbimodule
    ==> 1
    matrix N[2][2] = p, e*f,h,p*(p+1);
    is_cenSubbimodule(N); // N is not centralizing subbimodule
    ==> 0

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