Singular

D.5.7.9 displayCohom

Usage:

displayCohom(data,l,h,n); data intmat, l,h,n int

Assume:

h>=l, data is the return value of sheafCoh(M,l,h) or of sheafCohBGG(M,l,h), and the basering has n+1 variables.

Return:

none

Note:

The intmat is displayed in a diagram of the following form:

l l+1 h ---------------------------------------------------------- n: h^n(F(l)) h^n(F(l+1)) ...... h^n(F(h)) ............................................... 1: h^1(F(l)) h^1(F(l+1)) ...... h^1(F(h)) 0: h^0(F(l)) h^0(F(l+1)) ...... h^0(F(h)) ---------------------------------------------------------- chi: chi(F(l)) chi(F(l+1)) ...... chi(F(h))

where F refers to the associated sheaf of M on P^n.
A '-' in the diagram refers to a zero entry, a '*' refers to a negative entry (= dimension not yet determined).