19 lines
437 B
Text
19 lines
437 B
Text
inductive tree (A : Type) : Type :=
|
|
node : A → forest A → tree A
|
|
with forest (A : Type) : Type :=
|
|
nil : forest A,
|
|
cons : tree A → forest A → forest A
|
|
|
|
check tree.{1}
|
|
check forest.{1}
|
|
check tree.rec.{1 1}
|
|
check forest.rec.{1 1}
|
|
|
|
print "==============="
|
|
|
|
inductive group : Type :=
|
|
mk_group : Π (carrier : Type) (mul : carrier → carrier → carrier) (one : carrier), group
|
|
|
|
check group.{1}
|
|
check group.{2}
|
|
check group.rec.{1 1}
|