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: Linda is not a writer or it is sunny. It is snowing if and only if Thomas is climbing a mountain. Linda is a writer or it is snowing. Thomas is not climbing a mountain.
It is snowing or it is sunny can be inferred via the resolution rule. If it snows, then Thomas is climbing a mountain can be inferred via the biconditional elimination rule. If Thomas climbs a mountain, then it is snowing can be inferred via the biconditional elimination rule. It is not snowing can be inferred via the biconditional elimination rule.