current community chat blog MathOverflow MathOverflow Meta Sign up or log in to customize your list. more stack exchange communities Stack Exchange sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site MathOverflow Questions Tags Users Badges Unanswered Ask Question Take the 2-minute tour × MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. Where to buy premium white chalk in the U.S., like they have at RIMS? up vote 98 down vote favorite 58 While not a research-level math question, I'm sure this is a question of interest to many research-level mathematicians, wh...