files / problems / chowla-cosine / compute / README.md

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Compute — Chowla cosine, explicit c = 1/18

./run_all.sh

Expected: last line ALL OK, exit 0.

script role
verify_lemma72.py exact 32-window check of Bedert Lemma 7.2 in Q(sqrt(2))
lemma71_bounds.py arithmetic pack of the Young/split constants
track_constants.py builds certificate.json
verify_certificate.py rebuilds Cstar, checks 2048 Cstar <= 18^7
optimize_aux.py float search of (alpha, beta, phi); did not beat Bedert
qsqrt2.py, aux_rho.py exact arithmetic

Claim (not the square-root conjecture): for every n >= 1 and every n-element set of positive integers,

min_x sum_{a in A} cos(a x)  <=  - n^{1/7} / 18.