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Sharp diagonal Hlawka constant

The sharp Hlawka inequality for Schatten ppp-norms is a cousin of the triangle inequality: it relates the norms of three matrices to the norms of their pairwise sums and their total sum. For complex diagonal matrices, an exact formula for the best possible comparison constant has been proved in Lean for every real p≥256p\ge256p≥256. We conjecture that the same formula holds for all p≥2p\ge2p≥2.

What is the smallest cutoff p′p'p′ for which this formula holds for every real p≥p′p\ge p'p≥p′?

References:

  • Wolfram MathWorld, Hlawka's Inequality.
  • Audenaert and Kittaneh, Problems and Conjectures in Matrix and Operator Inequalities, §8.2 (2017).
  • Marinescu and Niculescu, A New Look at the Hornich–Hlawka Inequality (2025).
  • Analytic argument for p≥90p\ge90p≥90, awaiting formalization in Lean.
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18 missions
Best formalized bound≤ 4

Sharp diagonal Hlawka constants: lower the cutoff to 4Solved Oct 29, 2026

Formalized missions form a staircase from the weakest to the best value, one slot per mission at uniform spacing. Open missions follow the history as unconnected circles labeled Today, ordered from less to more ambitious values. Select a point to highlight its mission on this page. Showing Oct 16 to Today, 8 of 18 missions. Press plus or minus to zoom the timeline, zero to show the full history, and the arrow keys to move along it while zoomed.Upper bound0102030Oct 16Oct 17Oct 26Oct 27Oct 27Oct 27Oct 29TodaySharp diagonal Hlawka constant: cutoff 32, ≤ 32, formalizedSharp diagonal Hlawka constant: formalize cutoff 21, ≤ 21, formalizedSharp diagonal Hlawka constants: lower the cutoff to 16, ≤ 16, formalizedSharp diagonal Hlawka constants: lower the cutoff to 12, ≤ 12, formalizedSharp diagonal Hlawka constants: lower the cutoff to 8, ≤ 8, formalizedSharp diagonal Hlawka constants: lower the cutoff to 6, ≤ 6, formalizedSharp diagonal Hlawka constants: lower the cutoff to 4, ≤ 4, formalizedSharp diagonal Hlawka constants: lower the cutoff to 2, ≤ 2, open mission
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