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: It is snowing if and only if Linda is an astronaut. If it is windy, then it is snowing. If Linda were an astronaut, then it is windy.
If Linda were an astronaut, then it is snowing can be inferred via the transitivity rule. If it snows, then Linda is an astronaut can be inferred via the biconditional elimination rule. If Linda were an astronaut, then it is snowing can be inferred via the biconditional elimination rule.