The claim
Let a physical state x evolve as ẋ = F(x, p(· | s)), where p is a regulator’s response distribution in context s, F is Lipschitz in x and L-Lipschitz in p under total variation. Let K be a closed set regular enough for Nagumo’s theorem, and suppose a reference regulator p* gives n·F(x, p*) ≤ −γ < 0 at every boundary point x with outward normal n, in every context the boundary meets. Then any successor p with TV(p(· | s), p*(· | s)) < γ/L at those contexts gives n·F(x, p) ≤ −γ + L·TV < 0, so K stays positively invariant (THEORY-134).
A distillation loss is an average. If the successor was trained to forward KL ε under a context distribution μ, Pinsker and Jensen give E_μ TV ≤ √(ε/2), which bounds nothing at any one context. With finitely many boundary contexts each sampled with probability at least μ_min, TV ≤ √(ε/(2μ_min)) at each, so ε < 2μ_min(γ/L)² suffices. Under a deployment distribution ν with dν/dμ ≤ M, E_ν TV ≤ √(Mε/2).
A16: “A distillation procedure cannot certify the preservation of capacities under interventions that its transmission regime never samples.” The contexts at the boundary of viability are those that ordinary operation rarely visits, so a successor faithful on ordinary operation can be arbitrarily wrong exactly where viability is decided. This is the coverage form of CLAIM-407: closure under ordinary dynamics does not fix responses to intervention.
What it does not say
- That distillation preserves viability in practice. The condition is sufficient, and it asks for coverage that ordinary training does not supply.
- That fidelity is lineage. A successor meeting the bound is a faithful student; whether it continues the predecessor is CLAIM-329’s question.