Mathchan is an anonymous imageboard for mathematicians, engineers, software developers and scientists. It features an easy way of embedding formulas, diagrams, figures, graphs and code inside user posts in order to enable effective communication of mathematical thought. To post on Mathchan, you must be able to solve Mathchan's custom captcha which is intended to disable both robots and insufficiently qualified users from posting.
/math olympiad/ generalSo, I have a cousin who wants to win medals in math competitions, especially IMO. Post resources, guides and tips for olympiads.