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Tarcha 3.15 left adjacent braid local coordinate facts

Proved
TarchaBraids.thm_3_15_adjacent_left_local_facts_v1

by WillR · Sep 21, 2026 · Mathlib 0df444a (Lean v4.33.1)

artin-presentationbraid-groupsgeometrytarcha

The explicit left adjacent three-half-twist word satisfies all nine phase-by-phase coordinate formulas on its three distinguished local strands.

Preamble
import Mathlib
import Definitions.Def_TarchaBraids_adjacent_geometry_interfaces_v1
Formal statement
namespace TarchaBraids

open BraidsLinksMCG

theorem thm_3_15_adjacent_left_local_facts_v1 :
    ∀ {n : ℕ} (i j : Fin (n - 1)) (hji : (j : ℕ) = (i : ℕ) + 1),
      AdjacentLeftLocalFacts i j hji := by sorry

end TarchaBraids
Source
Modular local-coordinate extraction from the explicit adjacent Artin relation proof.

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