Solving An Insanely Hard Problem For High School Students

Olympiad problems are challenging for most of us. But this one was considered “easy” for the students taking the test! (The oldest students are in high school, but have also been 13 year old students who have taken the test and gotten a gold medal).

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Sources
https://www.imo-official.org/problems.aspx
https://www.imo-official.org/year_individual_r.aspx?year=2019&column=total&order=desc
https://artofproblemsolving.com/community/c6h1876068

IMO 2019 Problem 1

Quote
http://mathforum.org/library/drmath/view/53922.html

Further reading
https://en.wikipedia.org/wiki/Cauchy%27s_functional_equation
https://mathoverflow.net/questions/53431/does-any-research-mathematics-involve-solving-functional-equations
https://academia.stackexchange.com/questions/86451/does-the-international-math-olympiad-help-research-mathematics

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