Singular Manual: autX

| #### D.15.1.6 autX Procedure from library `autgradalg.lib` (see autgradalg_lib). Usage: autX(RL, w, TOR); RL: ideal, w: intvec, TOR: optional list of integers. Purpose: compute generators for the hopf algebra O(Aut(X)) of the Mori dream space X given by Cox(X) := basering/RL and the ample class w. Assume: there is no torsion. Return: a ring. Also exports an ideal Iexported. Example:
    LIB "autgradalg.lib";
    ///////////////
    //// CAREFUL: the following examples seems to be unfeasible at the moment, see remark in the paper
    //echo=2;
    ///////////////
    //// PP2
    //intmat Q[1][4] =
    //  1,1,1,1;
    //ring R = 0,T(1..ncols(Q)),dp;
    //// attach degree matrix Q to R:
    //setBaseMultigrading(Q);
    //ideal I = 0;
    //intvec w0 = 1;
    //def RR = autX(I, w0);
    //setring RR;
    //Iexported;
    //basering;
    //dim(std(Iexported));
    //kill RR, Q, R;
    ///////////////
    //// example 3.14 from the paper
    //intmat Q[3][5] =
    //  1,1,1,1,1,
    //  1,-1,0,0,1,
    //  1,1,1,0,0;
    //list TOR = 2;
    //ring R = 0,T(1..5),dp;
    //// attach degree matrix Q to R:
    //setBaseMultigrading(Q);
    //ideal I = T(1)*T(2) + T(3)^2 + T(4)^2;
    //list TOR = 2;
    //intvec w0 = 2,1,0;
    //def RR = autX(I, w0, TOR);
    //setring RR;
    //kill RR, Q, R;

User manual for Singular version 4.3.2p4, 2023, generated by texi2html.