Parimaths
A volunteer-run Saturday math club for high schoolers, free since 2007, built around hard problems that reward intuition more than what school has covered.
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A free math club for high school students, run by volunteers since 2007 with support from ENS Paris and Université Paris-Sud. Each Saturday afternoon, a beginner group and an advanced group work in parallel through lectures, problem sessions or talks, on a topic that changes every week. The focus is hard problems that need little prior knowledge. More than 500 students have taken part.