[Merged by Bors] - feat(archive/imo): formalize IMO 1964 problem 1 #4935
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@lacker you're the expert here -- I tried to follow your suggestions in the other thread about sticking as closely as possible to the actual question wording, when formalising the question. Let me know if there are other IMO question conventions I should be abiding by. |
jcommelin
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Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: Johan Commelin <johan@commelin.net>
bryangingechen
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Looks good to me from an "imo question conventions" point of view. |
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This is an alternative approach to #4369, where progress seems to have stalled. I avoid integers completely by working with `nat.modeq`, and deal with the cases of n mod 3 by simply breaking into three cases. Co-authored-by: Bryan Gin-ge Chen <bryangingechen@gmail.com>
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This is an alternative approach to #4369, where progress seems to have stalled. I avoid integers completely by working with
nat.modeq, and deal with the cases of n mod 3 by simply breaking into three cases.