[Merged by Bors] - feat(group_theory/subgroup/basic): Contrapositive of card_le_one_iff_eq_bot
#9918
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| (λ x hx, by simpa [subtype.ext_iff] using fintype.card_le_one_iff.1 h ⟨x, hx⟩ 1), | |||
| λ h, by simp [h]⟩ | |||
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| @[to_additive] lemma one_lt_card_iff_ne_bot [fintype H] : 1 < fintype.card H ↔ H ≠ ⊥ := | |||
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I was curious what to_additive does with the naming on things like this, and it turns out, it's not great. Not a problem for this PR, but I'll open an issue.
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…_eq_bot` (#9918) Adds contrapositive of `card_le_one_iff_eq_bot`.
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card_le_one_iff_eq_botcard_le_one_iff_eq_bot
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…_eq_bot` (#9918) Adds contrapositive of `card_le_one_iff_eq_bot`.
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Adds contrapositive of
card_le_one_iff_eq_bot.