resolution
=
;
ring R; ideal i=z2,x; resolution re=res(i,0); re; ==> 1 2 1 ==> R <-- R <-- R ==> ==> 0 1 2 ==> betti(re); ==> 1,1,0, ==> 0,1,1 list l = re; l; ==> [1]: ==> _[1]=x ==> _[2]=z2 ==> [2]: ==> _[1]=-z2*gen(1)+x*gen(2) ==> [3]: ==> _[1]=0