Translate the following inference to logic notation: If Robert were fast, then it is windy. If it is windy, then Robert is fast. For all x, x_11 is fast if and only if x_11 is bored. For all x, x_11 is not bored. Therefore it is not windy.
P(a) -> p. p -> P(a). forall x: P(x) <-> Q(x). forall x: ~Q(x). Therefore ~p.