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 not overcast or it is sunny. It is overcast or Elisabeth is bored. Elisabeth is bored if and only if Thomas is driving a car. Thomas is not driving a car.
Elisabeth is bored or it is sunny can be inferred via the resolution rule. If Elisabeth were bored, then Thomas is driving a car can be inferred via the biconditional elimination rule. If Thomas drives a car, then Elisabeth is bored can be inferred via the biconditional elimination rule. Elisabeth is not bored can be inferred via the biconditional elimination rule.