F. P. Schäfer died in 2011.
L. F. P. Curry died in 1977.
F. P. Raynham died on 1954-04-30.
P. F. Strawson died on 2006-02-13.
Benjamin F. P. Ivins died in 1962.
F. P. Holland died on 1928-01-18.
Charles F. P. Conybeare died in 1927.
Wolf Vostell's birth name is Wolf Schfer.
Michal Wager's birth name is Liselotte Schfer.
P-F is Polar
Thomas F. Conway died in 1946.
p --> q and q --> p are not equivalent p --> q and q --> (not)p are equivalent The truth table shows this. pq p --> q q -->(not)p f f t t f t t t t f f f t t t t
p > q~qTherefore, ~p| p | q | p > q | ~q | ~p || t | t | t | f | f || t | f | t | t | f || f | t | t | f | t || f | f | t | t | t |