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证明了带有中心球黑体的非均匀球形介质，在散射和裂变是各向同性的情况下，与时间有关的单能中子迁移算子的实本征值的代数重数为１．
It is proved that the nonnegative spherical medium with central blackbody body has an algebraic weight of 1 for the real eigenvalue of the time-dependent monoenergetic neutron transport operator when scattering and fission are isotropic.