The four stamps, issued by China Post, each depicts pi the mathematical constant, the Pythagorean theorem, Euler's formula and Mobius strip. [Photo by Jiang Dong/China Daily] They are enthralled ...
Wang Yusheng, the mathematician, and Gu Yunuo, a student, share their interest in mathematics at the launch ceremony of four math-themed stamps in Beijing. [Photo by Jiang Dong/China Daily] Wang ...
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