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 Elisabeth is driving a car. It is late if and only if it is cold. If Elisabeth drives a car, then it is cold.
It is cold if and only if Elisabeth is driving a car can be inferred via the biconditional introduction rule. Elisabeth is driving a car if and only if it is cold can be inferred via the biconditional introduction rule. If it is late, then it is cold can be inferred via the biconditional elimination rule. If it is cold, then it is late can be inferred via the biconditional elimination rule.