The result derived extends persistence of norm continuity oflinear strongly continuous semigroups and enriches theoryof semigroups of nonlinear operators.
结论推广了线性算子半群的范数连续性质保持，丰富和完善了非线性算子半群的理论。
2
By using linear operator theory in L2 space, we proved that the operatorsof this kind has not more than denumerable positive eigenvalues.