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source -- source of a map

Description

Gives the source of a map of rings, chain complexes or modules

See also

target -- target of a map

Ways to use source:

source(ChainComplexMap) -- find the source of a map of chain complexes
source(GradedModuleMap) -- find the source of a map of graded modules
source(Matrix) -- find the source module of matrix
source(RingMap) -- find the source ring for a map of rings
source(SheafMap) (missing documentation)

For the programmer

The object source is a method function.