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Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.

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Evidence

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The entry point runs every retained probe under util/ in its own interpreter, fails when any probe exits nonzero, and then checks the Eisenstein-grid enumeration's written results against the table on the motif note. It uses the root Python environment and the shared failure harness, reads no input files, and writes only the enumeration's JSON under ignored output/. Run it from the repository root:

sh
uv run --no-sync python wiki/research/erdos_132/evidence/main.py

util/continuation_checks.py performs bounded exact checks of the thirteen-point hexagram spectrum, the six-point invariant-shell obstruction, and the deletion-critical meanders at K=3,5,9K=3,5,9. The general arguments and exact scope are in small orders, dyadic distances, and deletion criticality. It is not a search or an independent reproduction of the published six-distance classification.

util/valuation_counterexample.py enumerates all 15 unordered pairs of the stated six-point Eisenstein-coordinate configuration and checks its complete spectrum. Four distances are rare; the failed claim concerns only the maximum distance within one valuation level. The same certificate includes the exactly checked nine-point example with both odd-shell extremes rich, and the five-point rational Eisenstein example with only three residue classes and a rich odd-shell maximum. Their spectra and the precise failed claims are recorded in dyadic distances.

util/split_class_example.py checks the rigid example of the split-class note for m=2,…,7m=2,\ldots,7 in exact arithmetic over Q(2,3)\mathbb Q(\sqrt2,\sqrt3): the unit class is the only class whose pairs have unequal absolute horizontal displacements, the unit triangle gives two independent equal-length tensors, and the exact rare count is at least (m2−4m−6)/4(m^2-4m-6)/4. The general bound and the circle-occupancy estimate are proved in the note and its claim, not computed. This probe can also be run alone from the repository root:

sh
uv run --no-sync python wiki/research/erdos_132/evidence/util/split_class_example.py

util/mixed_valuation_selector.py checks the six-point mixed-valuation obstruction of the selector note in exact rational arithmetic.

util/eisenstein_grid.py enumerates all nonempty subsets of the 4-by-4 Eisenstein grid in integer arithmetic and writes its results to output/eisenstein_grid_results.json; the entry point compares the minima and minimizer counts with the motif note's table. The motif note states the finite conclusions and proves the reduction used to rule out one-point extensions of its eleven-point example.

util/c3_hex_candidates_exact.py belongs to the unreviewed rotational report and needs SymPy. It concerns only one finite algebraic subcase and does not certify that report's other reductions. It is not evidence of a solution to either unrestricted question.