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Macaulay2 web site
Cremona
::
RationalMap _*
RationalMap _* -- direct image via a rational map
Synopsis
Usage:
phi_* I
phi I
Operator:
_*
Inputs:
phi
,
an object of class
RationalMap
,
I
a homogeneus ideal in the coordinate ring of the source of
phi
Outputs:
an
ideal
, the ideal of the closure of the direct image of
V(I)
via
phi
See also
RationalMap ^** Ideal
-- inverse image via a rational map
source(RationalMap)
-- coordinate ring of the source for a rational map