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: Mary is rich. For all y, y will go running if and only if y is rich.
There is at least one x for which x is rich can be inferred via the existential generalization rule. For all y, if y goes running, then y is rich can be inferred via the universal biconditional elimination rule. For all y, if y were rich, then y is running can be inferred via the universal biconditional elimination rule.