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MathlibNt.SieveTheory.LinearSieve.Suzuki.SuzukiCaseIISharpPositiveEndpointCoefficients

The part of the algebraic endpoint coefficient which is independent of the source cutoff parameter σ. In particular it is fixed once N and K are fixed.

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    The coefficient of σ in the algebraic endpoint coefficient. This is fixed once N and K are fixed.

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      noncomputable def MathlibNt.SieveTheory.caseIIQDEndpointCoeffA0 (_d Δ C K : ) :

      The coefficient left after removing the single factor σ from the cubic q_D(3) endpoint coefficient. (The argument d is retained to match the endpoint interface, although the explicit coefficient does not use it.)

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        The cubic-q_D(3) coefficient after cancelling the already present common scale C * exp (sqrt K) * E. The factor 3 pays for E ≥ 1/3, so this relative coefficient is independent of C.

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          Exact a₀ + σ a₁ decomposition of the algebraic coefficient occurring in caseIIAlgebraicEndpointCoeff. The statement displays that coefficient rather than using its coarse name as a black box.

          theorem MathlibNt.SieveTheory.caseIIQDEndpointCoeff_exact_sigma_split (d Δ σ C K : ) :
          72 * K ^ 2 * σ * (1 + 3 * K) * C * Real.exp K * (3 / 2) ^ Δ = σ * caseIIQDEndpointCoeffA0 d Δ C K

          Exact extraction of the single factor σ from the cubic q_D(3) endpoint coefficient.

          The raw cubic endpoint coefficient is paid by one (not two) copies of the common scale.

          The fixed-coefficient relative endpoint expression. Its only dependence on the moving source cutoff is through the three displayed factors σ. Consequently a₀, a₁, and aq₀ can be frozen before an eventual argument.

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            Exact coefficient identity before inserting the error envelope.

            theorem MathlibNt.SieveTheory.caseII_positiveEndpoint_packet_fixed_coefficients {N : } {D d Δ σ C K E L I B0 V lhs : } (hpacket : lhs B0 + V * (I + ((9 * K * SuzukiFiniteContinuousLayers.finiteSourceLayer 1 2 N 3 + 18 * K ^ 2 * σ * (1 + 3 * K) * SuzukiFiniteContinuousLayers.finiteSourceLayer 1 2 (N - 1) 2) * Real.log D ^ (Δ - 1) + 72 * K ^ 2 * σ * (1 + 3 * K) * C * Real.exp K * (3 / 2) ^ Δ / Real.log D + 27 * K * Real.log D ^ (Δ - 1) * E) * L)) :
            lhs B0 + V * (I + (caseIIAlgebraicEndpointCoeffA0 N K * Real.log D ^ (Δ - 1) + σ * caseIIAlgebraicEndpointCoeffA1 N K * Real.log D ^ (Δ - 1) + σ * caseIIQDEndpointCoeffA0 d Δ C K / Real.log D + 27 * K * Real.log D ^ (Δ - 1) * E) * L)

            Restatement of the positive endpoint packet with all σ-dependence exposed. Notice the position of E: the algebraic and cubic-q_D corrections do not carry E; only the sharp raw-base term does. This is the exact shape needed before any later common-envelope absorption.

            The premise is the positive endpoint packet written with the two explicit production coefficients. The conclusion is definitionally the same packet, but with fixed coefficients a₀, a₁, and aq₀.

            The same restatement specialized to the production normalization L = (log D)^(-Δ) and the production error envelope. This formulation makes its correct location manifest and is directly consumable by eventual bounds.