Consider the following premises. Mary is not a server or Michael is a scientist. Robert is working if and only if William is a lawyer. If Michael were a scientist, then Robert is working. Mary is a server or William is a lawyer. Can we infer the following from them? If we can, name the inference rule being used: Robert is working.
 From the fact that Robert is working if and only if William is a lawyer we can infer that if William were a lawyer, then Robert is working via biconditional elimination. From the fact that Mary is a server or William is a lawyer, and that Mary is not a server or Michael is a scientist we can infer that William is a lawyer or Michael is a scientist via resolution. Finally, from the fact that if William were a lawyer, then Robert is working, that if Michael were a scientist, then Robert is working, and that William is a lawyer or Michael is a scientist we can infer that Robert is working via disjunction elimination. Therefore, the answer is yes.