What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If James were a poet, then Richard is working. Linda is not a scientist. Linda is a scientist if and only if Richard is working.
If Linda were a scientist, then Richard is working can be inferred via the biconditional elimination rule. If Richard works, then Linda is a scientist can be inferred via the biconditional elimination rule. Richard is not working can be inferred via the biconditional elimination rule.