A protest poster showing a Friedmann equation was purportedly held up by students in Beijing's prestigious Tsinghua University - a play on the word "Friedmann", which sounds similar to "free 的 man" - quite literally translated to "a man who is free".
Friedmann is a Russian physicist and mathematician best-known for his work on the theory of relativity and for introducing the possibility of an expanding universe - a concept that may not have been lost on the protesting students.
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