Proposal: Math Challenges
I assume that questions from ongoing math competitions are certainly off topic, and perhaps even deserving of their own off-topic close reason. But should we consider old math contest problems on topic? Say, is it OK to delve dig up a question from the IMO archives and post it here?
There is a wealth of math contest problems that would be interesting to share and solve, so I am of the opinion that these should be on topic. Of course, attribution to the original source must be provided.