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Trivializing permutation coboundaries on the original fibre

Abstract

Trivializing permutation coboundaries on the original fibre.

Definition 1.1 (finiteFibreHomeomorph).

Lean statement: D5/S1/Dynamics/Symbolic/PermutativeLifts/FiniteActionTrivialization.finiteFibreHomeomorph

Formalization. D5/S1/Dynamics/Symbolic/PermutativeLifts/FiniteActionTrivialization.finiteFibreHomeomorph (✓ std3).

Source. Repository-derived.

Commentary.

A continuous permutation-valued transfer changes only the original discrete fibre coordinate; its inverse uses the transfer itself.

Theorem 1.2 (finiteFibreHomeomorph_conjugacy).

Lean statement: D5/S1/Dynamics/Symbolic/PermutativeLifts/FiniteActionTrivialization.finiteFibreHomeomorph_conjugacy

Proof. Machine-checked in Lean as D5/S1/Dynamics/Symbolic/PermutativeLifts/FiniteActionTrivialization.finiteFibreHomeomorph_conjugacy (✓ std3). ∎

Source. Repository-derived.

Commentary.

The transfer equation conjugates the skew step to the base step times the identity on the original fibre.

Theorem 1.3 (invariant_of_unitStep).

Lean statement: D5/S1/Dynamics/Symbolic/PermutativeLifts/FiniteActionTrivialization.invariant_of_unitStep

Proof. Machine-checked in Lean as D5/S1/Dynamics/Symbolic/PermutativeLifts/FiniteActionTrivialization.invariant_of_unitStep (✓ std3). ∎

Source. Repository-derived.

Commentary.

Invariance of a map under the integer generator implies invariance under every signed integer iterate.

References