Universal Central Extensions of LPNG Algebras
WANG Chunyue;ZHANG Qingcheng;WEI Zhu;ZHANG Chengcheng;School of Applied Sciences;Jilin Teachers Institute of Engineering and Technology;School of Mathematics and Statistics;Northeast Normal University;
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On the Crossing Number of the Joint Graph of a Path or a Cycle
ZHOU Zhidong;L Shengxiang;College of Mathematics and Computer Science;Hunan Normal University;Department of Mathematics and Computational Science;Hengyang Normal University;School of Mathematics and Computational Science;Hunan University of Science and Technology;
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