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MathlibNt.AnalyticNumberTheory.Vaughan.VaughanTypeIICanonicalShortLength

Short physical length on a canonical Vaughan Type-II shell #

For d in the canonical shell of level k, the collected variable t=e*m is supported on t ≤ y / 2^k. Consequently the primitive (prefix-maximal) large sieve is charged at this short length, not at the ambient length y. The last lemmas record the cancellation of the outer Möbius energy 2^k against this length and retain the resulting 2^k Q^2 charge.

The common long-variable length on the canonical d-shell of level k.

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    Every actual t=e*m fibre on level k lies below y / 2^k. This uses the closed lower shell endpoint 2^k ≤ d; in particular k=0 gives the literal bound t ≤ y.

    Outside the short shell length the actual tensor coefficient vanishes.

    Prefix-maximal primitive LS charged at y / 2^k, uniformly for every row of the canonical shell. The maximum remains inside the character sum.

    Exact natural cancellation of shell size against short length. This also covers k=0, where 2^0=1 and the quotient is exactly y.

    Expanded scale audit: after paying the 2^k outer energy, the length part is at most y, while the modulus part is exactly charged by 2^k Q^2.

    Primitive row-prefix bound with the shell energy already paid and the short large-sieve constant expanded. This is the formal cancellation 2^k * (y / 2^k) ≤ y; only the modulus term retains 2^k.

    theorem AnalyticNumberTheory.LargeSieve.imprimitive_conductor_window_family_le_linear_typeII (F : (d : ) → PrimitiveCharacter d) (hF : ∀ (d : ) (ψ : PrimitiveCharacter d), 0 F d ψ) (Q C : ) (hC : 0 < C) :
    dFinset.Icc C (2 * C), imprimitiveConductorWeight Q d * ψ : PrimitiveCharacter d, F d ψ ↑(Q / C) * conductorHarmonicFactor (Q / C) * dFinset.Icc 1 (2 * C), d / d.totient * ψ : PrimitiveCharacter d, F d ψ

    Generic linear-harmonic transport of a nonnegative primitive family over a conductor window. This is the conductor aggregation used by the short Type-II row-prefix bound.

    Conductor-window summary for the complete row-prefix maximum. Combining this with weighted_primitive_vaughanCanonicalTensorPrefix at cap 2*C and pow_mul_primitiveLargeSieveConstant_short_le yields the advertised shell charge O(y) + O(2^k C^2), times only the displayed prefix/conductor logs and the short tensor energy.

    Fully expanded conductor-window summary. The complete t-prefix maximum is retained, conductor multiplicity is linear-harmonic, and the primitive charge is y + 2^k * O(C^2) rather than 2^k * (y + O(C^2)).