Consider the following premises. For all z, z is a scientist if and only if z is fast. For all z, z will drive a car if and only if z is fast. For all z, z will not drive a car. For all z, if z were fast, then z is a scientist. Can we infer the following from them? There is at least one z for which z is a scientist.
 From the fact that for all z, z is a scientist if and only if z is fast we can infer that for all z, if z were a scientist, then z is fast. From the fact that for all z, z will drive a car if and only if z is fast, and that for all z, z will not drive a car we can infer that for all z, z is not fast. From the fact that for all z, if z were fast, then z is a scientist, and that for all z, if z were a scientist, then z is fast we can infer that for all z, z is fast if and only if z is a scientist. Finally, from the fact that for all z, z is fast if and only if z is a scientist, and that for all z, z is not fast we can infer that for all z, z is not a scientist, which contradicts that There is at least one z for which z is a scientist. Therefore, the answer is no.