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[Merged by Bors] - chore(data/finset): rename ext/ext'/ext_iff
#3069
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Looks great! We should codify this naming pattern in https://leanprover-community.github.io/contribute/naming.html. |
bryangingechen
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Jun 14, 2020
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I recorded the naming advice at leanprover-community/leanprover-community.github.io#60. |
Co-authored-by: Bryan Gin-ge Chen <[email protected]>
…thlib into finset-ext
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ext/ext'/ext_iffext/ext'/ext_iff
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Mar 15, 2022
…ty#3069) Now * `ext` is the `@[ext]` lemma; * `ext_iff` is the lemma `s₁ = s₂ ↔ ∀ a, a ∈ s₁ ↔ a ∈ s₂`. Also add 2 `norm_cast` attributes and a lemma `ssubset_iff_of_subset`.
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Now
extis the@[ext]lemma;ext_iffis the lemmas₁ = s₂ ↔ ∀ a, a ∈ s₁ ↔ a ∈ s₂.Also add 2
norm_castattributes and a lemmassubset_iff_of_subset.