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Quantitative geometry for the terminal single-wall radical

Proved
BianchiIX.exitSingle_terminal_geometry

by trppppp · Nov 5, 2026 · Mathlib 0df444a (Lean v4.33.1)

bianchi-ix-era-statisticsdynamical-systems

For y=(m,u,v,w)∈R4y=(m,u,v,w)\in\mathbb R^4y=(m,u,v,w)∈R4, define

K(u,v,w)=u2+v2+w2−2(uv+vw+wu),κ=u(v+w−u),K(u,v,w)=u^2+v^2+w^2-2(uv+vw+wu),\qquad \kappa=u(v+w-u),K(u,v,w)=u2+v2+w2−2(uv+vw+wu),κ=u(v+w−u), Fm=−v2+w2+u(v−w)−mκ,Fu=12(1−m2−(v−w)2+u2)u,F_m=-v^2+w^2+u(v-w)-m\kappa,\qquad F_u=\tfrac12(1-m^2-(v-w)^2+u^2)u,Fm​=−v2+w2+u(v−w)−mκ,Fu​=21​(1−m2−(v−w)2+u2)u, Fv=(m−1−κ)v,Fw=(−m−1−κ)w,F=(Fm,Fu,Fv,Fw),F_v=(m-1-\kappa)v,\qquad F_w=(-m-1-\kappa)w,\qquad F=(F_m,F_u,F_v,F_w),Fv​=(m−1−κ)v,Fw​=(−m−1−κ)w,F=(Fm​,Fu​,Fv​,Fw​),

and E(m,v)=(m−1)2+v2E(m,v)=(m-1)^2+v^2E(m,v)=(m−1)2+v2.

Write r(m,v)=(m−1)2+v2r(m,v)=\sqrt{(m-1)^2+v^2}r(m,v)=(m−1)2+v2​ and define

g(R,v)=R2−v2,d(R,u,v,w)=g(R,v)+u(v+w−u),g(R,v)=\sqrt{R^2-v^2},\qquad d(R,u,v,w)=g(R,v)+u(v+w-u),g(R,v)=R2−v2​,d(R,u,v,w)=g(R,v)+u(v+w−u), fR=−u(v+w−u)R−g(R,v)(u−w)2/Rd,f_R=\frac{-u(v+w-u)R-g(R,v)(u-w)^2/R}{d},fR​=d−u(v+w−u)R−g(R,v)(u−w)2/R​, as=2g(R,v)−R2+2vw−w2+u22d,aw=g(R,v)−2−u(v+w−u)d.a_s=\frac{2g(R,v)-R^2+2vw-w^2+u^2}{2d},\qquad a_w=\frac{g(R,v)-2-u(v+w-u)}d.as​=2d2g(R,v)−R2+2vw−w2+u2​,aw​=dg(R,v)−2−u(v+w−u)​.

The exit clock rate is ω(y)=1−m+u(v+w−u)\omega(y)=1-m+u(v+w-u)ω(y)=1−m+u(v+w−u), and its field is Flog⁡(y)=F(y)/ω(y)F_{\log}(y)=F(y)/\omega(y)Flog​(y)=F(y)/ω(y). Division and square roots have their total real-valued Lean meanings.

For Y=(R,u,w)Y=(R,u,w)Y=(R,u,w) define Ev(Y)=(fR,asu,aww)E_v(Y)=(f_R,a_su,a_ww)Ev​(Y)=(fR​,as​u,aw​w), evaluated at (R,u,v,w)(R,u,v,w)(R,u,v,w). The coordinate maps are Q(m,u,v,w)=(r(m,v),u,w)Q(m,u,v,w)=(r(m,v),u,w)Q(m,u,v,w)=(r(m,v),u,w) and Qv−1(R,u,w)=(1−g(R,v),u,v,w)Q_v^{-1}(R,u,w)=(1-g(R,v),u,v,w)Qv−1​(R,u,w)=(1−g(R,v),u,v,w). For a curve Y(s)Y(s)Y(s) set

Mi(Y,t)=exp⁡∫0tai(Y0(s),Y1(s),e−s,Y2(s)) ds(i=s,w).M_i(Y,t)=\exp\int_0^t a_i(Y_0(s),Y_1(s),e^{-s},Y_2(s))\,ds \quad(i=s,w).Mi​(Y,t)=exp∫0t​ai​(Y0​(s),Y1​(s),e−s,Y2​(s))ds(i=s,w).

Let Rα,b,A,D\mathcal R_{\alpha,b,A,D}Rα,b,A,D​ consist of the states satisfying

7/4≤R≤17/4,∣u∣,∣w∣≤1/100,∣u∣+∣w∣≤Ab,∣R−(2+2α)∣≤Db.7/4\leq R\leq17/4,\quad |u|,|w|\leq1/100,\quad |u|+|w|\leq Ab,\quad |R-(2+2\alpha)|\leq Db.7/4≤R≤17/4,∣u∣,∣w∣≤1/100,∣u∣+∣w∣≤Ab,∣R−(2+2α)∣≤Db.

Put

B(α,b,A,D,T)=[10(α+Db)+100(Ab)2]T+100Ab+5,B(\alpha,b,A,D,T)=[10(\alpha+Db)+100(Ab)^2]T+100Ab+5,B(α,b,A,D,T)=[10(α+Db)+100(Ab)2]T+100Ab+5, L(η,α,J)=log⁡(1/η)+Jlog⁡(1/α).L(\eta,\alpha,J)=\log(1/\eta)+J\log(1/\alpha).L(η,α,J)=log(1/η)+Jlog(1/α).

Define

H0=(2−g(R,v))2+v2,d0=(u−w)2−2v(u+w),H_0=(2-g(R,v))^2+v^2,\quad d_0=(u-w)^2-2v(u+w),H0​=(2−g(R,v))2+v2,d0​=(u−w)2−2v(u+w), e=d0[1+(R2−4+d0)/H0],σv(R,u,w)=(R2+e−2)/2.e=d_0[1+(R^2-4+d_0)/H_0],\qquad \sigma_v(R,u,w)=(\sqrt{R^2+e}-2)/2.e=d0​[1+(R2−4+d0​)/H0​],σv​(R,u,w)=(R2+e​−2)/2.

Put

H0,R=2(g−2)R/g,eR=d0[2R/H0−(R2−4+d0)H0,R/H02],H_{0,R}=2(g-2)R/g,\quad e_R=d_0[2R/H_0-(R^2-4+d_0)H_{0,R}/H_0^2],H0,R​=2(g−2)R/g,eR​=d0​[2R/H0​−(R2−4+d0​)H0,R​/H02​], ewall=1+(R2−4+2d0)/H0.e_{\rm wall}=1+(R^2-4+2d_0)/H_0.ewall​=1+(R2−4+2d0​)/H0​.

If 0<α≤10<\alpha\leq10<α≤1, b≤α/10000b\leq\alpha/10000b≤α/10000, ∣R−(2+2α)∣≤α/10000|R-(2+2\alpha)|\leq\alpha/10000∣R−(2+2α)∣≤α/10000, ∣u∣+∣w∣≤b|u|+|w|\leq b∣u∣+∣w∣≤b, and 0≤v≤α/1000\leq v\leq\alpha/1000≤v≤α/100, then

2<R≤5,2<g(R,v)≤5,v2<R2,α2≤H0,2<R\leq5,\quad2<g(R,v)\leq5,\quad v^2<R^2,\quad \alpha^2\leq H_0,2<R≤5,2<g(R,v)≤5,v2<R2,α2≤H0​, ∣d0∣≤α2/1000,∣R2−4+d0∣≤22α,H0+d0>0,R2−4+d0>0.|d_0|\leq\alpha^2/1000,\quad |R^2-4+d_0|\leq22\alpha,\quad H_0+d_0>0,\quad R^2-4+d_0>0.∣d0​∣≤α2/1000,∣R2−4+d0​∣≤22α,H0​+d0​>0,R2−4+d0​>0.
Preamble
import Definitions.Def_BianchiIX_Algebra_Flow
import Definitions.Def_BianchiIX_TerminalConnectionData
import Definitions.Def_BianchiIX_TerminalConeData
import Mathlib.Analysis.Calculus.Deriv.Pow
import Mathlib.Analysis.Calculus.Deriv.Mul
import Mathlib.Analysis.Calculus.Deriv.Add
import Mathlib.Analysis.Real.Sqrt
import Mathlib.Tactic.Linarith
import Mathlib.Tactic.Ring
import Mathlib.Analysis.Calculus.Deriv.Inv
import Mathlib.Tactic.FieldSimp
import Mathlib.Tactic.LinearCombination
import Mathlib.Analysis.SpecialFunctions.Arsinh
import Mathlib.Analysis.SpecialFunctions.Sqrt
import Mathlib.Analysis.SpecialFunctions.Pow.Deriv

noncomputable section
open BianchiIX

Formal statement
theorem BianchiIX.exitSingle_terminal_geometry {α b R u v w : ℝ} (hα : 0 < α ∧ α ≤ 1)
    (hb : b ≤ α / 10000) (hR : |R - (2 + 2 * α)| ≤ α / 10000)
    (hw : |u| + |w| ≤ b) (hv : 0 ≤ v ∧ v ≤ α / 100) :
    2 < R ∧ R ≤ 5 ∧ 2 < exitTailGap R v ∧ exitTailGap R v ≤ 5 ∧
      v ^ 2 < R ^ 2 ∧ α ^ 2 ≤ exitSingleBase R v ∧
      |exitSingleDefect u v w| ≤ α ^ 2 / 1000 ∧
      |R ^ 2 - 4 + exitSingleDefect u v w| ≤ 22 * α ∧
      0 < exitSingleBase R v + exitSingleDefect u v w ∧
      0 < R ^ 2 - 4 + exitSingleDefect u v w := by sorry
Source
https://github.com/l46430640-del/ERA-STATISTICS-FORMAL/blob/d74c241819f896ab8d050b21ace80c8e90eabd9e/BianchiIX/Algebra/ExitSinglePhaseBounds.lean#L20-L67

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