数学季刊 ›› 2006, Vol. 21 ›› Issue (2): 196-201.
摘要: To obtain a better Vinogradov’s bound, assistant function with two or three zeros and all Dirichlet’s characters has been evaluated. Assistant function g(X1,X2,X3,X4) with four zeros and all nonprincipal characters but X1X2X3X4 is constructed and evaluated in the paper. And the constant obtained is 8.395 511 841 994.
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