×
模态框(Modal)标题
在这里添加一些文本
Close
Close
Submit
Cancel
Confirm
×
模态框(Modal)标题
×
中国科学院数学与系统科学研究院期刊网
ISSN 0583-1431 CN 11-2039/O1
Toggle navigation
AMS
Home
About
Editorial Board
Instruction
Subscription
Download
Contact Us
中文
A NOTE ON THE 4-VALUED PROPOSITIONAL CALCULUS AND THE FOUR COLOUR PROBLEM
SHIH-HUA HOO(1);CHIANG-YE
Acta Mathematica Sinica, Chinese Series . 1951, (
3
): 243 -246 . DOI: 10.12386/A1951sxxb0011