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Stay pure and innocent. Be a child.
要保持数学工作者的纯粹, 纯粹得像一个小孩.

• Professor Xi once said, we should ask whether the math is delightful rather than whether it is useful.
  席老师曾说, 不要问数学有没有用, 而要问数学有没有趣.
  
  
  Professor Xi, writing a wedding card for his student, Feb. 2022. / 正在为学生写新婚贺卡的席老师, 2022 年 02 月.
  (Photo by Tao Gui / 桂弢供图)

• I am not a member of the Communist Party of China. But my grandfather is, and he has been a member for over 50 years. Someone sympathized his low pension. My grandfather said, "The people have given me too much. What have I done for the people? It is not worth that much." He is 90 years old currently, and living a healthy and happy life. Recently he learned how to use WeChat (Oct., 2023).
  我不是中共党员. 但我爷爷是, 而且入党已经超过了 50 年. 曾有人同情他的退休金过少. 我爷爷说: "人民给我这些已经太多了, 我为人民做了什么? 根本值不了这么多钱." 他 90 岁了, 目前身体健康, 心情愉快, 最近学会了如何使用微信 (2023 年 10 月).
  
  
  Received the "Honor in the Party for 50 Years" Medal on the centenary of CPC, June 2021. / 建党百年之际领取 "光荣在党 50 年" 奖章, 2021 年 06 月.
  (Photo by my old man / 俺爹供图)

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