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