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javadmath-

2017 IMO Problem #2


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دریافت ویدئو: حجم کم کیفیت بالا
توسط javadmath در 19 Mar 2018
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Error in 14:00. Can be fixed like this:
f(f(r)*f(s)) = -1 IMPLIES f(f(r)*f(s) + 1) = 0.... (E1)
This is so because we have proven it at 10:00.
Earlier, we established that the root of f is 1. So E1 implies f(r)*f(s) + 1 = 1 and so f(r)*f(s) = 0. The rest is the same as in the video.
I would like to thank Khaled Karaman for pointing out the error and Mike Lyons for providing an easy patch.

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