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Macaulay2 web site
SpecialFanoFourfolds
::
normalSheaf
normalSheaf -- normal sheaf
Synopsis
Usage:
normalSheaf I
normalSheaf(I,J)
Inputs:
I
,
an
ideal
, the ideal of a subvariety
X⊂ℙ
n
J
,
an
ideal
, the ideal of a subvariety
Y⊂ℙ
n
such that
X⊂Y
(if not given, it is assumed to be
Y = ℙ
n
)
Outputs:
a
coherent sheaf
, the normal sheaf
N
X,Y
of
X
in
Y
Ways to use
normalSheaf
:
normalSheaf(Ideal)
normalSheaf(Ideal,Ideal)