DEFINITION subst1_confluence_neq()
TYPE =
∀t0:T
.∀t1:T
.∀u1:T
.∀i1:nat
.subst1 i1 u1 t0 t1
→∀t2:T.∀u2:T.∀i2:nat.(subst1 i2 u2 t0 t2)→(not (eq nat i1 i2))→(ex2 T λt:T.subst1 i2 u2 t1 t λt:T.subst1 i1 u1 t2 t)
BODY =
Show proof