Not AND. The Boolean function which iS true unleSS both itS argumentS are true, the logical complement of AND: A NAND B = NOT (A AND B) = (NOT A) OR (NOT B) ItStruth table iS: A | B | A NAND B --+---+--------- F | F | T F | T | T T | F | T T | T | F NAND, like NOR, formS a complete Set of Boolean functionS on itS own Since it can be uSed to make NOT, AND, OR and any other Boolean function: NOT A = A NAND A A AND B = NOT (A NAND B) A OR B = (NOT A) NAND (NOT B) (1995-01-24)