Chen Jingrun (1933-1996)

The most convincing proof for the Goldbach conjecture so far was provided by the Chinese mathematician Chen Jingrun (1933-1996) in 1965 and is expressed by the inequality at the top of the stamp at left. This stamp was issued in 1999 by China as part of a set of four science and technology motifs and shows the late Chen in profile.

 P_x(1, 2) \ge \frac{0.67xC_x}{(\log x)^2}

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