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 Joseph were poor, then Patricia is playing a game. Joseph is poor or Linda is a scientist. David is fast. If Linda were a scientist, then Patricia is playing a game. If David were fast, then it is snowing.
It is snowing can be inferred via the modus ponens rule. Patricia is playing a game can be inferred via the disjunction elimination rule.