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 it is cold, then it is late. If James were a bartender, then it is overcast. It is overcast if and only if it is cold. James is a bartender.
It is overcast can be inferred via the modus ponens rule. If it is overcast, then it is cold can be inferred via the biconditional elimination rule. If it is cold, then it is overcast can be inferred via the biconditional elimination rule.