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: If Thomas were curious, then it is overcast. If Thomas were curious, then it is overcast. If it is overcast, then Thomas is curious. Thomas is not curious.
It is not overcast can be inferred via the modus tollens rule. Thomas is curious if and only if it is overcast can be inferred via the biconditional introduction rule. Thomas is curious if and only if it is overcast can be inferred via the biconditional introduction rule. It is overcast if and only if Thomas is curious can be inferred via the biconditional introduction rule. It is overcast if and only if Thomas is curious can be inferred via the biconditional introduction rule.