lean4-htt/doc/examples/NFM2022/nfm1.lean
2022-05-23 18:20:37 -07:00

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/- "Hello world" -/
#eval "hello" ++ " " ++ "world"
-- "hello world"
#check true
-- Bool
def x := 10
#eval x + 2
-- 12
def double (x : Int) := 2*x
#eval double 3
-- 6
#check double
-- Int → Int
example : double 4 = 8 := rfl