[Merged by Bors] - feat(list): add some lemmas #9873
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Add a few lemmas about lists. These are helpful when manipulating lists.
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Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
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| @@ -734,6 +734,15 @@ theorem mem_last'_eq_last : ∀ {l : list α} {x : α}, x ∈ l.last' → ∃ h, | |||
| rwa [last_cons] | |||
| end | |||
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| theorem last'_eq_last_of_ne_nil : ∀ {l : list α} (h : l ≠ []), l.last' = some (l.last h) | |||
| | [] h := (h rfl).elim | |||
| | [a] _ := by {unfold last, unfold last'} | |||
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| | [a] _ := by {unfold last, unfold last'} | |
| | [a] _ := rfl |
Maybe it's too late for this for this PR, but rfl does work here.
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Add a few lemmas about lists. These are helpful when manipulating lists. Co-authored-by: Ethan Pronovost <EPronovost@users.noreply.github.com>
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Add a few lemmas about lists. These are helpful when manipulating lists. Co-authored-by: Ethan Pronovost <EPronovost@users.noreply.github.com>
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Add a few lemmas about lists.
These are helpful when manipulating lists.