Maxwell's Conjecture on Point-Charge Equilibria
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Statement
Do point charges whose electrostatic potential has only non-degenerate critical points always have at most of them? A configuration of five charges - three at the vertices of an equilateral triangle plus two small central charges pulled apart into a shallow bipyramid - has at least non-degenerate critical points, so the conjecture is false.
Context
Traces to Maxwell's 1873 Treatise; the modern form drove work in potential theory and real algebraic geometry.
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The idea behind the counterexample construction was suggested by the model; the authors verified all mathematical details and wrote the note.
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