三、习题作业: 教材 P37 习题 2 2.4 设 X={0,1,2,3},X 上有如下两个关系: R 1 ={(i,j)|j=i+1 或 j=i/2} R 2 ={(i,j)|i=j+2} 求下列复合关系: ( 1 ) R 1 R 2 ; (2) R 2 R 1 ; (3) R 1 R 2 R 1 2.5 设有 X 上的关系 R 1 , R 2 , R 3 ,试证: ( 1 )如果 R 1 Í R 2 ,则 R 1 R 3 Í R 2 R 3
【简答题】Affordable Boutique Hotels in New York City By STEPHEN HEYMAN June 20, 2010 A new breed of hotels is trying to stand out from the masses with designer details, memorable allowances and prices ...