I just started with Lean and with this nice SE.
In the official web book/tutorial, when explaining definitions https://leanprover.github.io/theorem_proving_in_lean/index.html they ask to complete this (partial) definition of curry (in paragraph 2.4):
def curry (α β γ : Type*) (f : α × β → γ) : α → β → γ := sorry
def curry (α β γ : Type*) (f : α × β → γ) : α → β → γ := λ x y, f (x,y)
and it seems to be accepted by the system.
Is this definition correct? If yes, how do I use it?
I expected something like
curry x y f or
curry f x y
should work, but they don't.
Actually the given (partial) definition is of type
α → β → γ so it expects just 2 arguments of type α and
β respectively, but no function
Thank you for your help