A ring R is left co-semihereditary (strongly left co-semihereditary) if every finitely cogenerated factor of a finitely ......

利用离散时间单生过程Poisson方程解的表示和最小非负解理论,用统一的方法给出了过程常返,正常返,强遍历,l遍历,几何遍历的显式判......