OAI/Combinatorics/ProgressionColoring/ConstructionDichotomyDenominator.lean

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Denominators after the construction's dilation

The actual dilation contains every primary part of a period of size at most twice the cutoff whose prime is at most the square of the dimension. Thus a reduced denominator is either one or exceeds the square of the dimension.

  1. theorem OAI.QuantitativeVanDerWaerden.ConstructionModel.short_period_dvd_lambda line 18

    Source documentation

    The actual dilation kills every period up to the dimension squared.

    theorem short_period_dvd_lambda {k h : ℕ} (hh : 0 < h)
        (hmax : h ≤ 2 * cutoff k) (hshort : h ≤ dimension k ^ 2) :
        h ∣ lambda k :=
    …

    Mentions: OAI.QuantitativeVanDerWaerden.ConstructionModel.lambda

  2. theorem OAI.QuantitativeVanDerWaerden.ConstructionModel.reducedDenominator_gt_of_not_dvd line 25

    Source documentation

    A nonintegral dilated fraction has denominator larger than the dimension squared. This applies to every natural numerator, including zero.

    theorem reducedDenominator_gt_of_not_dvd {k h t : ℕ} (hh : 0 < h)
        (hmax : h ≤ 2 * cutoff k) (hnot : ¬ h ∣ lambda k * t) :
        dimension k ^ 2 < h / Nat.gcd h (lambda k * t) := by
    …

    Mentions: OAI.QuantitativeVanDerWaerden.ConstructionModel.lambda