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: Linda is a doctor. If it is late, then Linda is not a doctor. It is cloudy. If Mary were a politician, then it is late.
It is not late can be inferred via the modus tollens rule. Linda is a doctor and it is cloudy can be inferred via the conjunction rule. It is cloudy and Linda is a doctor can be inferred via the conjunction rule.