Proof of `Actual frame observations realize the nominal channel contractions` (1st statement)
groundedproofs/Lax342547Proofs/RawContractions.lean · lax-342547
What this proof establishes
no assumptions
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
An endpoint-supported nominal primal or channel vector selects exactly the corresponding P, Q, X, or Y block of the joint observation matrix.