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D.15.24.16 dualSheaf

Procedure from library schubert.lib (see schubert_lib).

Usage:
dualSheaf(S); S sheaf

Return:
sheaf

Theory:
This is the dual of a sheaf

Example:
 
LIB "schubert.lib";
variety G = Grassmannian(2,4);
def R = G.baseRing;
setring R;
sheaf S = makeSheaf(G,subBundle);
sheaf D = dualSheaf(S);
D;
==> A sheaf of rank  2
==>
See also: addSheaf; quotSheaf; symmetricPowerSheaf; tensorSheaf.