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arXiv · 2609.07000

An Improved Lower Bound for the Complex Grothendieck Constant

Shengtao Guo·Ethan X. Fang·Junwei Lu
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Abstract

We prove $K_G^{\mathbb{C}}>1.35584631827168$ for the classical complex Grothendieck constant, closing more than one quarter of the gap between Davie's lower bound and Haagerup's upper bound. The numerical part of the proof is rigorously verified by interval arithmetic. The lower bound and the proof were discovered by the Odin Automatic AI Research Agent.

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Shengtao Guo, Ethan X. Fang, Junwei Lu. 2026-09-07. An Improved Lower Bound for the Complex Grothendieck Constant. https://arxiv.org/abs/2609.07000

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