lean2/tests/lean/run/basic.lean

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constant A.{l1 l2} : Type.{l1} → Type.{l2}
check A
definition tst.{l} (A : Type) (B : Type) (C : Type.{l}) : Type := A → B → C
check tst
constant group.{l} : Type.{l+1}
constant carrier.{l} : group.{l} → Type.{l}
definition to_carrier (g : group) := carrier g
check to_carrier.{1}
section
variable A : Type
check A
definition B := A → A
end
constant N : Type.{1}
check B N
constant f : B N
check f
constant a : N
check f a
section
variable T1 : Type
variable T2 : Type
variable f : T1 → T2 → T2
definition double (a : T1) (b : T2) := f a (f a b)
end
check double
check double.{1 2}
definition Prop := Type.{0}
constant eq : Π {A : Type}, A → A → Prop
infix `=`:50 := eq
check eq.{1}
context
universe l
universe u
variable {T1 : Type.{l}}
variable {T2 : Type.{l}}
variable {T3 : Type.{u}}
variable f : T1 → T2 → T2
definition is_proj2 := ∀ x y, f x y = y
definition is_proj3 (f : T1 → T2 → T3 → T3) := ∀ x y z, f x y z = z
end
check @is_proj2.{1}
check @is_proj3.{1 2}
namespace foo
section
variables {T1 T2 : Type}
variable {T3 : Type}
variable f : T1 → T2 → T2
definition is_proj2 := ∀ x y, f x y = y
definition is_proj3 (f : T1 → T2 → T3 → T3) := ∀ x y z, f x y z = z
end
check @foo.is_proj2.{1}
check @foo.is_proj3.{1 2}
end foo
namespace bla
section
variable {T1 : Type}
variable {T2 : Type}
variable {T3 : Type}
variable f : T1 → T2 → T2
definition is_proj2 := ∀ x y, f x y = y
definition is_proj3 (f : T1 → T2 → T3 → T3) := ∀ x y z, f x y z = z
end
check @bla.is_proj2.{1 2}
check @bla.is_proj3.{1 2 3}
end bla