lean2/tests/lean/run/fun.lean

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import logic algebra.function
open function bool
constant f : num → bool
constant g : num → num
check f ∘ g ∘ g
check typeof id : num → num
constant h : num → bool → num
check flip h
check flip h ff num.zero
check typeof flip h ff num.zero : num
constant f1 : num → num → bool
constant f2 : bool → num
check (f1 on f2) ff tt