[Merged by Bors] - feat(data/list/*): subperm_singleton_iff #11680
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ericrbg
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Jan 27, 2022
ericrbg
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src/data/list/count.lean
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| @@ -131,6 +131,9 @@ lemma le_count_iff_repeat_sublist {a : α} {l : list α} {n : ℕ} : | |||
| by rw ← this; apply filter_sublist, | |||
| λ h, by simpa only [count_repeat] using h.count_le a⟩ | |||
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| @[simp] lemma one_le_count_iff_mem {a : α} {l : list α} : 1 ≤ count a l ↔ a ∈ l := | |||
| by { convert list.le_count_iff_repeat_sublist, simp } | |||
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Is there an easier proof of this via count_pos?
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ahh, yes, I knew it had to be there already. i also made count_pos a simp-lemma - I'm fairly unsure whether we should do that for both, or not.
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