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source(RationalMap) -- coordinate ring of the source for a rational map

Function: source
Usage:

source phi
Inputs:
- phi, a rational map
Outputs:
- a ring, the coordinate ring of the source of phi

Description

This is equivalent to target map phi.

See also

target(RationalMap) -- coordinate ring of the target for a rational map

Ways to use this method:

source(RationalMap) -- coordinate ring of the source for a rational map

The source of this document is in Cremona/documentation.m2:472:0.