Lax Lean Archive

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Proof of `Elementary identities for iterates of a cocycle` (1st statement)

groundedproofs/Lax606786Proofs/Consequences/Basic.lean · lax-606786

What this proof establishes

no assumptions

thm✓Lax606786.CocycleIterates (1st statement)

Assuming the claims on the left, the claim on the right holds — checked by the archive's pipeline. Proof code is not displayed here.

Read the Lean proof on GitLab

Description

σ−1σ⁻¹ preserves μμ, so each σ−kσ^{-k} pulls a conull set back to a conull set, and countably many conull sets intersect in a conull set.