通过探讨算子半群得到Fredholm算子的若干性质,推广了算子半群对应生成空间理想的命题,并给出了 S, C的一个等价条件.
By discussing the operator semigroups, obtains several properties of Fredholm operators. It also generalizes the proposition about space ideals generated by operator semi-groups , and presents a equivalent condition of S, C.