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D4.4b: one-step q-seed pump

Proved
FiniteMagmaE677.period_four_swapped_s_q_fixer_one_step

by mysticflounder · Sep 24, 2026 · Mathlib 0df444a (Lean v4.33.1)

e677magmaperiod-fourrenewal

Write Lx(y)=x⋄yL_x(y)=x\diamond yLx​(y)=x⋄y and let Cz={Lxi(z):0≤i<dz}C_z=\{L_x^i(z):0\le i<d_z\}Cz​={Lxi​(z):0≤i<dz​} for an exact first-return cycle of length dzd_zdz​. Let a finite magma satisfy E677, with an exact first-return cycle at ttt and the swapped-S cycle-renewal packet. Assume q=c2⋄xq=c_2\diamond xq=c2​⋄x and s=c3⋄qs=c_3\diamond qs=c3​⋄q. Put p=q⋄(q⋄x)p=q\diamond(q\diamond x)p=q⋄(q⋄x) and u=q⋄pu=q\diamond pu=q⋄p.

There is a one-step packet retaining the renewal input and canonical q/s equations. It records freshness of both p,up,up,u outside the six named points, u≠pu\ne pu=p, p⋄q=qp\diamond q=qp⋄q=q, q⋄u=qq\diamond u=qq⋄u=q, and u⋄q≠qu\diamond q\ne qu⋄q=q, together with all five cycle-location alternatives:

  1. Both p,up,up,u lie on CtC_tCt​, at distinct phases.
  2. ppp lies on CtC_tCt​ and uuu starts a disjoint cycle.
  3. ppp starts a new cycle and uuu lies on CtC_tCt​.
  4. ppp starts a new cycle and uuu lies at a strictly positive phase of CpC_pCp​.
  5. ppp starts a new cycle and uuu starts a cycle disjoint from both Ct,CpC_t,C_pCt​,Cp​.

Contact phases carry their exact equations and bounds; escaping seeds carry exact first-return data. This asserts one step, without an iteration or termination conclusion.

Preamble
import Definitions.Def_FiniteMagmaE677_sswap_renewal
import Mathlib

universe u
open FiniteMagmaE677
Formal statement
theorem FiniteMagmaE677.period_four_swapped_s_q_fixer_one_step
{α : Type u} [Fintype α] (op : α → α → α) (h : FiniteMagmaE677.E677 op)
(x c1 c2 c3 q s t : α)
(first : FirstReturn.D4FirstReturn op x c1 c2 c3 t 0)
(input : SSwap.CycleRenewal op x c1 c2 c3 q s t first)
(q_eq : q = op c2 x) (s_eq : s = op c3 q) :
SSwap.Pump op x c1 c2 c3 q s t (op q (op q x)) (op q (op q (op q x))) first := by sorry
Source
Adam McKenna, The Missing Pair (private repository), revision f9945b937be61f4ca48eb6cafdcfa07ba7a7f78c, lean/E677/Spine/Piece1D4SSwapQFixerPump.lean, line 87. The accepted proof on this platform is the public record.

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