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[Merged by Bors] - feat(analysis/convex/quasiconvex): A quasilinear function is either monotone or antitone#17801
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YaelDillies wants to merge 4 commits intomasterfrom
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[Merged by Bors] - feat(analysis/convex/quasiconvex): A quasilinear function is either monotone or antitone#17801YaelDillies wants to merge 4 commits intomasterfrom
YaelDillies wants to merge 4 commits intomasterfrom
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…onotone or antitone
eric-wieser
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Bors d+
I tried to golf not_monotone_not_antitone_iff_exists_le_le but couldn't. Notice there is a build failure
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…onotone or antitone (#17801) Fulfill a todo I left a year ago. The proof is a big case bash on the relative positions of the four variables. I minimised it as much as I could. The end result mentions convexity, but this is mostly order theory.
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Fulfill a todo I left a year ago. The proof is a big case bash on the relative positions of the four variables. I minimised it as much as I could.
The end result mentions convexity, but this is mostly order theory.
I will open the mathlib4 PR once we agreed on where to put the monotonicity lemmas.
It's very offputting that we don't have access to
set.has_coe_to_sortinorder.monotone. This is probably good enough reason to split updata.set.basic.