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: William is not a writer. William is a writer if and only if Karen is curious.
If William were a writer, then Karen is curious can be inferred via the biconditional elimination rule. If Karen were curious, then William is a writer can be inferred via the biconditional elimination rule. Karen is not curious can be inferred via the biconditional elimination rule.