DEFINITION getl_refl()
TYPE =
∀b:B.∀c:C.∀u:T.(getl O (CHead c (Bind b) u) (CHead c (Bind b) u))
BODY =
assume b: B
assume c: C
assume u: T
(h1)
by (drop_refl .)
drop O O (CHead c (Bind b) u) (CHead c (Bind b) u)
end of h1
(h2)
by (clear_bind . . .)
clear (CHead c (Bind b) u) (CHead c (Bind b) u)
end of h2
by (getl_intro . . . . h1 h2)
we proved getl O (CHead c (Bind b) u) (CHead c (Bind b) u)
we proved ∀b:B.∀c:C.∀u:T.(getl O (CHead c (Bind b) u) (CHead c (Bind b) u))