schubert.lib
LIB "schubert.lib"; variety X; X.dimension = 4; ring r = 0,(c(1..2),d(1..3)),wp(1..2,1..3); setring r; X.baseRing = r; poly c = 1 + c(1) + c(2); poly ch = 2 + logg(c,4); sheaf S = makeSheaf(X,ch); S; ==> A sheaf of rank 2 ==>