Proof using.
red. unfold append_entries_came_from_leaders. intros.
find_apply_hyp_hyp.
find_apply_hyp_hyp. repeat find_higher_order_rewrite. eauto.
Qed.

Lemma append_entries_came_from_leaders_init :
refined_raft_net_invariant_init append_entries_came_from_leaders.