 LIB "brnoeth.lib";
int plevel=printlevel;
printlevel=1;
ring s=2,(x,y),lp;
list HC=Adj_div(x3+y2+y);
==> The genus of the curve is 1
HC=NSplaces(1..2,HC);
HC=extcurve(2,HC);
==> Total number of rational places : NrRatPl = 9
def ER=HC[1][4];
setring ER;
intvec G=5; // the rational divisor G = 5*HC[3][1]
intvec D=2..9; // D = sum of the rational places no. 2..9 over F_4
// let us construct the corresponding residual AG code :
matrix C=AGcode_Omega(G,D,HC);
==> Vector basis successfully computed
// here is a linear code of type [8,3,>=5] over F_4
print(C);
==> 1, 0, (a+1),(a), 1,1,0,0,
==> (a),(a+1),1, 0, 1,0,1,0,
==> (a),(a), (a+1),(a+1),1,0,0,1
printlevel=plevel;
