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Question: 18d28...

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18(d),2818. Mathematicians say that statement P is stronger than statement Q if Q is true whenever P is true, but not conversely. (In other words, P is stronger than Q means that PQ is always true, but Q-P is not true, in general.) Use truth tables to show the following. (a) a Л b is stronger than a (b) a is stronger than a V b. (c) a ^ b is stronger than a V b. (d) b is stronger than a -» b28. The NAND connective T is defined by the following truth table. p q ptq TİTİ F FITI T Use truth tables to show that p T q is logically equivalent to -(pAq). (This explains the name NAND: Not AND.)

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