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[Merged by Bors] - chore(*): Miscellaneous lemmas#18677
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YaelDillies wants to merge 7 commits intomasterfrom
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[Merged by Bors] - chore(*): Miscellaneous lemmas#18677YaelDillies wants to merge 7 commits intomasterfrom
YaelDillies wants to merge 7 commits intomasterfrom
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bors d+
I think this should probably just be titled chore(*): miscellaneous lemmas, and then just add 5 or so bullet points in the description summarize the themes (probably one per file)
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{a | p a} ∩ s = {a ∈ s | p a}
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* `algebra.support`: `support n = univ` if `n ≠ 0`, `mul_support n = univ` if `n ≠ 1`
* `data.int.char_zero`: `↑n = 1 ↔ n = 1`
* `data.real.ennreal`: `of_real a.to_real = a ↔ a ≠ ⊤`, `(of_real a).to_real = a ↔ 0 ≤ a`
* `data.set.basic`: `s ∩ {a | p a} = {a ∈ s | p a}`
* `logic.function.basic`: `on_fun f g a b = f (g a) (g b)`
* `order.conditionally_complete_lattice.basic`: Lemmas unfolding the definition of `Sup`/`Inf` on `with_top`/`with_bot`
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algebra.support:support n = univifn ≠ 0,mul_support n = univifn ≠ 1data.int.char_zero:↑n = 1 ↔ n = 1data.real.ennreal:of_real a.to_real = a ↔ a ≠ ⊤,(of_real a).to_real = a ↔ 0 ≤ adata.set.basic:s ∩ {a | p a} = {a ∈ s | p a}logic.function.basic:on_fun f g a b = f (g a) (g b)order.conditionally_complete_lattice.basic: Lemmas unfolding the definition ofSup/Infonwith_top/with_bot