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OP-12009AnalysisOpen

The complex Grothendieck constant ( $C_{10b}$ )

The complex Grothendieck constant: determine C 10b or improve its bounds; the repository records 1.338 (lower) and 1.40491 (upper).

Optimization Constants in Mathematics — Davis, Ivanisvili & Tao· Licensed source statement· 2026

OP-12008AnalysisOpen

The real Grothendieck constant ( $C_{10a}$ )

The real Grothendieck constant: determine C 10a or improve its bounds; the repository records frac 6 pi 11 approx 1.71360 (lower) and frac pi 2 log(1+ sqrt 2 ) - 10^ -4 approx 1.78211 (upper).

Optimization Constants in Mathematics — Davis, Ivanisvili & Tao· Licensed source statement· 2026

The complex Grothendieck constant (C10bC_{10b}C10b​)

The real Grothendieck constant (C10aC_{10a}C10a​)

The complex Grothendieck constant ( $C_{10b}$ )

The real Grothendieck constant ( $C_{10a}$ )