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: Jennifer is not making tea. If Barbara were sad, then it is snowing. Jennifer is making tea if and only if it is snowing. If Linda were a poet, then Barbara is sad.
If Linda were a poet, then it is snowing can be inferred via the transitivity rule. If Jennifer makes tea, then it is snowing can be inferred via the biconditional elimination rule. If it snows, then Jennifer is making tea can be inferred via the biconditional elimination rule. It is not snowing can be inferred via the biconditional elimination rule.