Hint Resolve multipar_context_independent.

Lemma multipar_iapp : forall G D a c y L,
y `notin` fv_tm_tm_tm a \u L ->
(forall x, x `notin` L -> RhoCheck Irrel x (open_tm_wrt_tm a (a_Var_f x))) ->
multipar G D (open_tm_wrt_tm a a_Bullet) c ->
multipar G D (a_UAbs Irrel a) (a_UAbs Irrel (close_tm_wrt_tm y c)).