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: David is making tea or Karen is not an astronaut. Karen is an astronaut or it is snowing. David is not making tea.
Karen is not an astronaut can be inferred via the disjunctive syllogism rule. If Karen were an astronaut, then David is making tea can be inferred via the rewriting rule.