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[Merged by Bors] - feat(intervals/image_preimage): preimage under multiplication #3757

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@urkud urkud commented Aug 13, 2020

Add lemmas preimage_mul_const_Ixx and preimage_const_mul_Ixx.
Also generalize equiv.mul_left and equiv.mul_right to units.


Add lemmas `preimage_mul_const_Ixx` and `preimage_const_mul_Ixx`.
Other changes:

* `to_units` doesn't work with `to_additive`, so move the `to_fun`
part to `units.mk'`.
* Generalize `equiv.mul_left` and `equiv.mul_right` to `units`.
@urkud urkud added the awaiting-review The author would like community review of the PR label Aug 13, 2020
src/data/equiv/mul_add.lean Outdated Show resolved Hide resolved
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bors r+

@github-actions github-actions bot added ready-to-merge All that is left is for bors to build and merge this PR. (Remember you need to say `bors r+`.) and removed awaiting-review The author would like community review of the PR labels Aug 13, 2020
bors bot pushed a commit that referenced this pull request Aug 13, 2020
Add lemmas `preimage_mul_const_Ixx` and `preimage_const_mul_Ixx`.
Also generalize `equiv.mul_left` and `equiv.mul_right` to `units`.
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bors bot commented Aug 13, 2020

Pull request successfully merged into master.

Build succeeded:

@bors bors bot changed the title feat(intervals/image_preimage): preimage under multiplication [Merged by Bors] - feat(intervals/image_preimage): preimage under multiplication Aug 13, 2020
@bors bors bot closed this Aug 13, 2020
@bors bors bot deleted the interval-image branch August 13, 2020 15:59
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