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LeanPool.CIVAxisymmetric.Regularity.ThetaContraction

One-step contraction of the scale-invariant quantity #

The one-step contraction of the scale-invariant quantity in the iteration of the CKN manuscript's iteration proposition (with its convention for κ, η, ε_* and the force coefficient C₂₉), stated for abstract real numbers.

theorem CIV.theta_contraction_of_beta_small {C₂₇ C₂₈ T Tnext b L : ℝ} (hC₂₇ : 0 < C₂₇) (hC₂₈ : 0 < C₂₈) (hT : 0 ≤ T) (hL : 0 ≤ L) (hb : 0 ≤ b) (hbsmall : b ≤ CKN.iterationEpsilonStar C₂₇) (hdec : Tnext ≤ C₂₇ * CKN.iterationKappa C₂₇ ^ (2 / 3) * T + C₂₇ * CKN.iterationKappa C₂₇ ^ (-5) * (b ^ (1 / 2) + b) * T + C₂₈ * CKN.iterationKappa C₂₇ ^ (-1 / 2) * T ^ (1 / 2) * L ^ (1 / 2) + C₂₈ * CKN.iterationKappa C₂₇ ^ (-3) * L) :
Tnext ≤ 3 / 8 * T + CKN.iterationC₂₉ C₂₇ C₂₈ * L