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 cold if and only if Linda is an astronaut. If it is cold, then Jennifer is drinking water. It is cold or Jennifer is not drinking water.
If Jennifer drinks water, then it is cold can be inferred via the rewriting rule. If it is cold, then Linda is an astronaut can be inferred via the biconditional elimination rule. If Linda were an astronaut, then it is cold can be inferred via the biconditional elimination rule.