摘要
本文讨论了Ｈｉｌｂｅｒｔ空间中一类二阶线性阻尼弹性系统中阻尼算子 Ｂ＝Ｂ１＋ｉＢ２的 实部、虚部之定义域互不包含情形的系统半群性质．
The semigroup properties of the second order linear damped elastic system in Hilbert spaces for the damped operator B=B1+iB2 in which D(B1) and D(B2) don't contain each other are discussed, where D(·) is the domain for some operator, i is the imaginary u- nit.
