History Knuth proposed a three-valued logic similar to Lukasiewicz's. He speculated that mathematics would become even more elegant than in traditional bi-valued logic. His insight was to use the integral range [-1,0+1]rather than[0,1,2].History ⚫ Knuth proposed a three-valued logic similar to Lukasiewicz’s. ⚫ He speculated that mathematics would become even more elegant than in traditional bi-valued logic. ⚫ His insight was to use the integral range [-1, 0 +1] rather than [0, 1, 2]