Letter to Zhang Youjin[1]
(April 10, 1950)

Mr. Lucun:
I received and read your esteemed letter of the 19th of December last year. I am most grateful for the instruction you have kindly offered from afar! I respectfully send this reply. Wishing you peace and health!

Mao Zedong
April 10, 1950

[1] Zhang Youjin taught mathematics at the Hunan Provincial First Normal School when Mao Zedong was a student there.

Collected Works of Mao Zedong, Volume 28, p. 230