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D.5.17.20 addSheaf
Procedure from library schubert.lib (see schubert_lib).
- Usage:
- addSheaf(A,B); A sheaf, B sheaf
- Return:
- sheaf
- Theory:
- This is the direct sum of two sheaves.
Example:
| | LIB "schubert.lib";
variety G = Grassmannian(3,5);
def r = G.baseRing;
setring r;
sheaf S = makeSheaf(G,subBundle);
sheaf Q = makeSheaf(G,quotientBundle);
sheaf D = S + Q;
D;
==> A sheaf of rank 5
==>
D.ChernCharacter == rankSheaf(D);
==> 1
totalChernClass(D) == 1;
==> 1
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See also:
dualSheaf;
quotSheaf;
symmetricPowerSheaf;
tensorSheaf.
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