效绵鼎 Operations on Languages RE's use three operations:union,concatenation, and Kleene star. The union of languages is the usual thing,since languages are sets. ■Example:{01,111,10{00,01}={01,111,10,00} 33 Operations on Languages ◼ RE’s use three operations: union, concatenation, and Kleene star. ◼ The union of languages is the usual thing, since languages are sets. ◼ Example: {01,111,10}{00, 01} = {01,111,10,00}