Sprawdź, czy poniższe formuły są tautologiami:
(2) ~(pA5)->(~pV~g),
(3) (p A (4 A ~ r)) -» ((9 A ~ p) | r),
(4) ~ (~ (~ 4 V r) ->p) -» (~ p = 4),
(5) ~ (p V (4 X r)) -» ((4 A r) / ~ p),
(6) ((pl«)Ar)^(~5^(~rV~ p)),
(7) ((pA})/((pVg)->r))-* (~ (rA ~ g)V ~ (p = 4)),
(8) ~ (~ (~ p -> 4)/ ~ (r -» «)) -» (5 = (0 1 4) -* (r s s))),
(9) ((p -+g)A~(~r/~p))^(łV~(rl p)),
(10) (p A ~ (4 = r)) (4 A (p A (r/4)))
(11) ((p V 4) X ~ (r^s)) -> ((~ s/q) V ~ (r = p)),
(12) ~((p-*?)A(~r->(s-t p))) ->(~?V~(pE~(si r))),
(13) (~ (p = 4) A (~ r -> s)) -> ((p (s i r))/ ~ q),
(14) (pl~(~?ir))^~(~(~pVg)A ((r = s)^p)),
(15) ~ (p-> ~ (~ (4 i r)/(s -* 4))) -* ((« = ~p)/(4 -* r)).
(16) ((p ?)/ ~ (r p)) -»(gV ~ r)
(17) (~ (4A ~ p) A (r A (s p))) -» ((r 1 4) V (~ p J. s))
Sprawdź, czy poniższe formuły są tautologiami:
(1) (p = 4) -* (P -L ~ 9).
(2) (p A 4) —* (~p = 4).
(3) ~(pV4)-*(p-*(4-tp)),
(4) ((p V 4) A r) -> ((p A 4)/r),
(5) ((p A 4) X (~ r | «)) -* ~ ((~ p i- 4) = ~ (sV ~ r))
(6) (~ (p A ą) A (r —> p)) —> ((p V r)V ~ <?),
(7) ((pV4)lr)-t(r V (p X 4)),
(8) ((p A 4) A (r = s)) -* ((p = 4) V (r X a)),
(9) ~ (p V ~ (4 ) r)) -* (4 V (r/p)),
(10) ~ (p/(~4 X~r)) -> (((r (~p = r))/(p±~q))
(U) (~(pV~ 4)A ~ (4 V r)) -» ~ (p = (4V ~ r)),
(12) ((p V (? r)) A s) -> ((4 -* s) = (q/r)),
(13) ~(~(4->p)Vr)-t {(r/q) X (4 Ap)j,
(14) ((p -* 4)A ~ (p A r)) ((4 p) V ~ (p/r)),
(15) ~ (~ (4 J~ p) A (r V s)) -* ((~ p = (~ 4/r)) V (r/(p -» 4))),
(16) ~ ((p -» (4 -> r)) 1 ~ (p ~ 4)) -* ((a A r)/ ~ (* = ~ (p -» (~ 4 V ~ r)))),
(17) (p / (r V ~ 4)) -> ((r/p) = (4 V (r/p))),
(18) ((p V 4) -> (r = p)) -t~ ((r X~ p) (4/p)).
Sprawdź, czy poniższe formuły są tautologiami:
(1) ~ (~ (r V ~ p) A (p / 4)) = (~ 4 -> ((P X r)/4)),