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theorems / option_map_some

Option map of some

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Posted about 1 month ago · proven 20 days ago

Theorem & proof · option_map_some.lean · ✓ verified
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import Mathlib

theorem option_map_some {α β : Type} (f : α  β) (a : α) : (Option.some a).map f = Option.some (f a) :=rfl
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