Consider the following premises. u_4 or R_13(i). forall x_13: R_13(x_13) -> S_13(x_13). p <-> S_13(i). ~u_4 or p. Can we infer S_13(i) from them?
 From forall x_13: R_13(x_13) -> S_13(x_13) we can infer R_13(i) -> S_13(i). From u_4 or R_13(i), ~u_4 or p we can infer R_13(i) or p. From p <-> S_13(i) we can infer p -> S_13(i). Finally, from R_13(i) -> S_13(i), p -> S_13(i), R_13(i) or p we can infer S_13(i). Therefore, the answer is yes.