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 late if and only if it is not cold. Charles is not playing tennis. It is cold if and only if Charles is playing tennis.
If it is late, then it is not cold can be inferred via the biconditional elimination rule. If it is cold, then Charles is playing tennis can be inferred via the biconditional elimination rule. If it is not cold, then it is late can be inferred via the biconditional elimination rule. If Charles plays tennis, then it is cold can be inferred via the biconditional elimination rule. It is not cold can be inferred via the biconditional elimination rule.