Remark rcop2_trans_xi :
 forall s1 : Site, xi (rec_copy2_trans c0 s2) s1 = xi c0 s1.Remark rcop2_trans_yi :
 forall s1 : Site, yi (rec_copy2_trans c0 s2) s1 = yi c0 s1.

Lemma rcop2_trans_sigma_yi : sigma_yi (rec_copy2_trans c0 s2) = sigma_yi c0.