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, Vol. 1 ›› Issue (3) : 243-246.
A NOTE ON THE 4-VALUED PROPOSITIONAL CALCULUS AND THE FOUR COLOUR PROBLEM
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