Yuan Zhou’s scientific contributions

In this paper, firstly as a short note, we prove that a left derivation of a semiprime $\Gamma$-ring M must map M into its center, which improves a result by Paul and Halder and some results by Asci and Ceran. Also we prove that a semiprime $\Gamma$-ring with a strong commutativity preserving derivation on itself must be commutative and that a strong commutativity preserving endomorphism on a semiprime $\Gamma$-ring M must have the form $\sigma(x)=x+\zeta(x)$ where $\zeta$ is a map from M into its center, which extends some results by Bell and Daif to semiprime $\Gamma$-rings.