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julia> preimage_map(u)
Map defined by a Julia function
from integers
to integers
IMHO preimage should be supported by all maps where it makes sense (whether they have a section or are outright invertible). And personally I'd also like to see image(f,x) work in addition to f(x) but that's secondary.
There are two tests in AA which seem to use
preimage
:But in general there don't seem to be
preimage
methods. I took this examples fromtest/generic/MapWithInverse-test.jl
:But playing with this reveals
image
andpreimage
don't exist and in general I found no way to get a preimage other than asking for the preimage mapWe only have this:
IMHO
preimage
should be supported by all maps where it makes sense (whether they have a section or are outright invertible). And personally I'd also like to seeimage(f,x)
work in addition tof(x)
but that's secondary.Originally posted by @fingolfin in #1441 (comment)
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