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[Merged by Bors] - refactor(ring_theory/ideal/*, ring_theory/jacobson): use comm_semiring
instead of comm_ring
for ideals
#5954
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af91307
start using `comm_semiring` in `ideal`
adomani 5c99415
fix algebra/ring_quot
adomani e1c73cd
fix ring_theory/jacobson_ideal
adomani b796475
remove temporary file
adomani a432356
fix ring_theory/jacobson
adomani 3f9e0c7
Merge branch 'master' of github.com:leanprover-community/mathlib into…
adomani 9c04b60
Merge branch 'master' of github.com:leanprover-community/mathlib into…
adomani da02236
cleaning up
adomani d198c17
add module doc-strings
adomani d8bd499
move three lemmas to ring_theory/ideal/over
adomani e09e0d6
Update src/algebra/ring_quot.lean
adomani da22901
Update src/ring_theory/ideal/over.lean
adomani 26b66af
Update src/ring_theory/ideal/basic.lean
adomani 0360340
Update src/ring_theory/ideal/basic.lean
adomani 3271184
Update src/ring_theory/ideal/basic.lean
adomani b0d1dcd
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At a glance, I'm surprised this isn't true for semirings
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Eric, you are right: below is a proof (the first one that I found) of the "same" result for a submodule of
R
, whenR
is asemiring
.However, at the moment,
ideal
is only defined for acomm_semiring
. In fact, I think that what you suggest should be a separate PR, in case it is not already there.More generally, we should have a "theory" of cyclic modules, i.e. modules generated by a single element, where this result would fit nicely, replacing
1 : R
by a generating element of the module.