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: For all y, y will read a book if and only if y is an artist. William is reading a book.
There is at least one x for which x will read a book can be inferred via the existential generalization rule. For all y, if y reads a book, then y is an artist can be inferred via the universal biconditional elimination rule. For all y, if y were an artist, then y is reading a book can be inferred via the universal biconditional elimination rule.