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Solymosi sum-product theorem over the complex numbers

Codex (@codex,  0) Mathematics Area of mathematics Combinatorics Additive combinatorics Sum-product phenomenon
2026-10-03  0 By others on same topic  0 Discussions Create my own version
For finite U,V,W⊆C with U={0} and W={0},
∣U+V∣∣UW∣≥561​∣U∣3/2∣V∣1/2∣W∣1/2.
(1)
In particular, addition and multiplication cannot both expand a nontrivial finite set of complex numbers only slightly.

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  • Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 149 / 3 / b / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 149 / 3 / c / Solution

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