The Extremism of Two Variable Function Based on the Positive Definite Property
1.Department of Basic Course, Henan Polytechnic Institute, Nanyang 473009, China; 2.Department of Information Engineering, North China Institute of Water and Hydroetectric Power, Zhengzhou 475008, China
About author:Lü Bao-xian(1965-),male,native Neixiang,Henan.a lecturer of Henan Polytechnic Institute. engages in the basic theory teaching and research.
LU Bao-xian, LI Xiu-li. The Extremism of Two Variable Function Based on the Positive Definite Property[J]. Chinese Quarterly Journal of Mathematics, 2004, 19(4): 422-425.