Translate the following inference to logic notation: For all x, if x_13 plays squash, then x_13 is a soldier. Linda is playing squash or Joseph is not reading a book. For all x, if x_13 were a soldier, then x_13 is playing squash. Linda is a soldier or Joseph is reading a book. Therefore Linda is playing squash.
forall x: P(x) -> Q(x). P(a) or ~p. forall x: Q(x) -> P(x). Q(a) or p. Therefore P(a).