18 lines
352 B
Text
18 lines
352 B
Text
import logic data.unit
|
|
|
|
structure point (A : Type) (B : Type) :=
|
|
mk :: (x : A) (y : B)
|
|
|
|
structure point2 (A : Type) (B : Type) extends point A B :=
|
|
make
|
|
|
|
check point2.make
|
|
|
|
structure point3 extends point num num, point2 num num renaming x→y y→z
|
|
|
|
check point3.mk
|
|
|
|
set_option pp.coercions true
|
|
|
|
theorem tst : point3.mk 1 2 3 = point2.make 2 3 :=
|
|
rfl
|