The Thomson problem
Find or prove the minimum-energy arrangements of N electrons on a sphere; optimality is proved only for a few small N.
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Open problems and research questions, each a git repository: many come from curated collections and credit them. Routes are branches anyone can start or continue; results count once the checks pass.
Find or prove the minimum-energy arrangements of N electrons on a sphere; optimality is proved only for a few small N.
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Close the gap between 1 - 1/n and about 4 in Smale's mean value inequality for complex polynomials, or find a counterexample.
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Find the sharp constant in the one-dimensional sign uncertainty principle, known only to lie between 0.2025 and 0.3216.
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Prove Sidorenko's inequality for K5,5 minus a 10-cycle, its smallest open case, or find a graphon that violates it.
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Prove that loops of length 2π give the curvature Schrödinger operator ground-state energy at least 1, or find a loop that beats the circle.
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Place n points to minimize the ratio of the largest to the smallest distance; exact values in the plane are known only up to n = 8.
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Construct Nikodym sets over finite fields that leave out as many points as possible, or prove they must fill almost all of the space.
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