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from the IMO shortlist...
Michael Penn
Nov 23, 2020
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Slovenia Math Olympiad | 2005: Q2
Too hard for the IMO? Too easy?
a nice floor problem from the IMO long list.
a nice geometry puzzle
When is the reciprocal the inverse?
Solving a crazy iterated floor equation.
A Fun One from the Vietnamese IMO
Two from Africa!
The smallest such prime...
Mathematicians Use Numbers Differently From The Rest of Us
You should know this number theory result -- Bertrand's Postulate
This is always even??
Moldova Mathematical Olympiad | 2000 Q2 and Q4
My IMO story
French Math Olympiad | 1999 Q2
Indian National Math Olympiad | 2019 Q3
Almost an IMO Problem | IMO Shortlist 2019 N2
a floor equation.
generalizing a Calculus 2 integral
A number theory problem from Morocco!