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Optimizer: update the dense BFGS inverse Hessian in O(n²) instead of O(n³) - #3443

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jachymb:feature/bfgs-update-rank-two
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Optimizer: update the dense BFGS inverse Hessian in O(n²) instead of O(n³)#3443
jachymb wants to merge 5 commits into
stan-dev:developfrom
jachymb:feature/bfgs-update-rank-two

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  1. Commits on Oct 18, 2026

  2. Commits on Oct 25, 2026

  3. Commits on Oct 27, 2026

  4. Commits on Oct 30, 2026