« previous | Wednesday, February 2, 2011 | next »
¬ ( p ∧ q ) ≡ ¬ p ∨ ¬ q ¬ ( p ∨ q ) ≡ ¬ p ∧ ¬ q {\displaystyle {\begin{aligned}\neg (p\wedge q)&\equiv \neg p\vee \neg q\\\neg (p\vee q)&\equiv \neg p\wedge \neg q\end{aligned}}}
