it just works. no special machinery needed. the boolean operators distribute over derivatives the same way union does. derivatives are such a powerful and interesting tool that i will dedicate a separate post to them, but the main point is that they give us a simple and uniform way to handle all regular language features, including intersection and complement.
Number (8): Everything in this space must add up to 8. The answer is 2-5, placed vertically.
，更多细节参见搜狗输入法下载
They started out in the NFL as tenants at Wrigley Field, sharing the baseball cathedral with the Cubs for 50 seasons before the league insisted all teams play in a stadium with a capacity of at least 50,000. So in 1971, the Bears decamped to Soldier Field, where they’ve been ever since – save for a season-long “road trip” in 2002 to the University of Illinois’ Memorial Stadium during renovations. Soldier Field is prime football real estate: neoclassical, on the downtown lakefront, with sweeping views of one of America’s most sumptuous skylines. But the lease terms are crazy, the city park district (which owns the stadium) is a borderline slumlord, and the Bears – star-crossed to play in the league’s oldest and smallest stadium while representing its third-largest market – have outgrown the place.
然而，定居中國的美國學者、加拿大國際治理創新中心資深研究員唐根（Einar Tangen）向半島新聞網批評，日本在與那國部署導彈是「計算好的升級，將增加區域緊張」，因為宣布時機選在高市訪美前，他認為高市在強化右翼基本盤並遠離戰後和平主義憲法，從中國視角，這是東京干涉台灣問題，激化北京回應。