Proof of `CDA coefficients in minimal formal realizations` (1st statement)
groundedproofs/Lax825748Proofs/CDACoefficients.lean · lax-825748
What this proof establishes
Assuming the claims on the left, the claim on the right holds — checked by the archive's pipeline. Proof code is not displayed here.
Description
Extend the prescribed coordinates inside the shuffle algebra to a chart on its common Lie stabilizer. Pull back the algebra, adjoin the reciprocal of the frame determinant, and set the extra variables to zero.