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image -- image of a map

Description

image h -- yields the image of the homomorphism h.

The result will be a submodule of the target of h

If h is a ring element, it is interpreted as a one by one matrix.

Ways to use image :

image(ChainComplexMap)
image(GradedModuleMap)
image(Matrix)
image(RingElement)
image(SheafMap) (missing documentation)

For the programmer

The object image is a method function.