05952504

j

05952504 Wu, Yanhua Properties of determinate knowledge systems. J. Zhangzhou Norm. Univ., Nat. Sci. 23, No. 2, 10-14 (2010). 2010 Editorial Department of Journal of Zhangzhou Normal University, Zhangzhoum Fujian ZH knowledge systems inevitable operator possible operator determinate knowledge Summary: This paper considers determinate knowledge systems and discusses conditions under which the closure of $\cup, \cap,\sim$ weakens to being only the closure of $\cap, \sim$ or the closure of $\cup, \sim$.