具有{}和{1,2,3}的a(3)=45集合系统在交集下闭合,如下所示({}与{1,2,3}未显示)。这些集合系统的BII编号如下所示A326880型.
0 {1} {1}{2} {1}{2}{3} {1}{2}{3}{12} {1}{2}{3}{12}{13}
{2} {1}{3} {1}{2}{12} {1}{2}{3}{13} {1}{2}{3}{12}{23}
{3} {2}{3} {1}{2}{13} {1}{2}{3}{23} {1}{2}{3}{13}{23}
{12} {1}{12} {1}{2}{23} {1}{2}{12}{13}
{13} {1}{13} {1}{3}{12} {1}{2}{12}{23}
{23} {1}{23} {1}{3}{13} {1}{3}{12}{13} {1}{2}{3}{12}{13}{23}
{2}{12} {1}{3}{23} {1}{3}{13}{23}
{2}{13} {2}{3}{12} {2}{3}{12}{23}
{2}{23} {2}{3}{13} {2}{3}{13}{23}
{3}{12} {2}{3}{23}
{3}{13} {1}{12}{13}
{3}{23} {2}{12}{23}
{3}{13}{23}
(结束)
|