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Macaulay2 web site
Cremona
::
isInverseMap
isInverseMap -- checks whether a rational map is the inverse of another
Synopsis
Usage:
isInverseMap(phi,psi)
Inputs:
phi
,
a
ring map
, representing a rational map
Φ:X--->Y
psi
,
a
ring map
, representing a rational map
Ψ:Y--->X
Outputs:
a
Boolean value
, according to the condition that the composition
Ψ Φ:X--->X
coincides with the identity of
X
(as a rational map)
Ways to use
isInverseMap
:
isInverseMap(RingMap,RingMap)