Consider the following premises. If Robert reads a book, then Linda is a poet. For all x_9, x_9 is rich if and only if x_9 is a poet. Can we infer the following from them? If Robert reads a book, then Linda is rich.
 From the fact that for all x_9, x_9 is rich if and only if x_9 is a poet we can infer that for all x_9, if x_9 were a poet, then x_9 is rich. From the fact that for all x_9, if x_9 were a poet, then x_9 is rich we can infer that if Linda were a poet, then Linda is rich. Finally, from the fact that if Robert reads a book, then Linda is a poet, and that if Linda were a poet, then Linda is rich we can infer that if Robert reads a book, then Linda is rich. Therefore, the answer is yes.