Appendix G on the web
Lean proof spine A machine-checked conditional skeleton: if the stated definitions, certificates, and bridge assumptions hold, then the certification claims follow. Lean does not prove real systems satisfy the bridges.
Spine00Overview
Lean proof spine overview: four sub-spines into certified-class safety
S1
Spine I
Boundary & measurement
(P05–P11, P09, P36, MB1, MB7a–b, MB9)
→ BoundaryAligned, BIQ, handles, GroundingViable
S2
Spine II
Value & transport
(P14–P22, P37, MB2–3)
→ BundleTransport, BearerTransport
S1->S2
identifiability
constraints
S3
Spine III
Correction & successors
(P23–P29, P13, MB4–5, MB7c, MB8, MB10)
→ CCI, Risk, SuccessorSafe, TrueHarm
S1->S3
BIQ / control
+ MB7a–b
P02
P02 LayeredAligned
7 layers: boundary, bundle, bearer,
correction, successor, basin, adversarial
S1->P02
boundary layer
MB7
MB7a→b→c→d
(adversarial + inferential UAD bridges)
S1->MB7
S2->S3
transport &
bearer maps
S2->P02
bundle +
bearer layers
S4
Spine IV
Selection & limits
(P12, P31–P34, P41–P45,
MB6a–b, MB7d)
→ percolation evidence, basin, normative boundary
S3->S4
successor &
risk exports
S3->P02
correction +
successor layers
P30
P30 Certified-class safety
Control ≤ CCI + δ ⇒ Risk ≤ δ
S3->P30
P13 risk bound
S4->P02
basin + limits
P35
P35 Basin stability
S4->P35
MB6a
MB6a
Percolation evidence ⇒ basin
S4->MB6a
P02->P30
P01
P01 Basin invariant
P35->P01
P01->P30
P30T
P30T Top theorem
LayeredAligned ∧ Risk ≤ δ
(certified_class_safety_from_spine_and_bridges)
P30->P30T
P40
P40 Safety-case leaves
P40->P30
MB7->P02
AdversariallyRobust layer
MB6b
MB6b
Basin ⇒ correction
MB6a->MB6b
MB6b->P02
CorrectionIntegrity
+ basin layer
Field-agenda crosswalk Each external alignment agenda maps to a book-facing projection or separation, proved on a shared finite domain in Lean. Every row links to a gem card with the crosswalk formula, Lean symbol, published work, and book chapters. Status ledger and proofs: Lean proof spine .
Agenda Book-facing claim Chapters CIRL / scalar reward inference gem Scalar reward inference is exactly k=1 bundle inference; full transport implies cooperative readability. The Value-Bundle Model , What Values Apply To , The End of Unconscious Value Drift Shutdown / off-switch gem Shutdown is a one-bit projection of correction-channel integrity; the converse fails. Correction Is a Causal Channel , Correction Channels under Adversarial Pressure , The End of Unconscious Value Drift Safe interruptibility gem Orseau–Armstrong interrupt neutrality is weaker than preserving usable correction bandwidth. Correction Is a Causal Channel , Beyond Following Instruction , The End of Unconscious Value Drift Christiano corrigibility gem Corrigibility is a dynamical correction invariant (basin contraction + capacity floor), not local act satisfaction. Beyond Following Instruction , The End of Unconscious Value Drift AUP / relative reachability gem Option preservation and low-impact penalties are separable from trajectory correction integrity. Correction Channels under Adversarial Pressure , When Value Change Is the Thing at Stake , The End of Unconscious Value Drift Quantilizers gem Local quantile safety does not imply trajectory-level correction integrity. Correction Channels under Adversarial Pressure , The End of Unconscious Value Drift Debate gem Local truth selection need not preserve the judge's correction channel. Manipulation, Domestication, and False Consent , Checking a System at Every Level , The End of Unconscious Value Drift ELK gem Latent readout is an epistemic subchannel, not correction uptake. What Values Apply To , What Survives an Adversary: Verifiability and Representability , The End of Unconscious Value Drift
Field results rederived and subsumed External alignment agendas projected into the book's invariants on a shared finite domain.
Bridge assumptions MB1–MB10 connect measured systems to book predicates. Bridges are never hidden inside definitions.
Complete Lean proof spine Proved nodes, counterexamples, and how the four sub-spines compose into certified-class safety.
Modules Module Book chapters Core carriers and bridges AlignmentProofSpine/Core.leanfoundations Boundaries and measurement AlignmentProofSpine/Boundaries.lean6–7, 10, 36 Capability and B-IQ AlignmentProofSpine/Capability.lean11–14, 33, 36 Value bundles and transport AlignmentProofSpine/Bundles.lean15–23, 30 Correction channels AlignmentProofSpine/Correction.lean25–29, 41–43 Successors and continuity AlignmentProofSpine/Successors.lean28–31 Basins, layers, certification AlignmentProofSpine/Certification.lean1–5, 35, 39, 44 Adversarial measurement AlignmentProofSpine/Adversarial.lean32–37 Successor forgeability (MB10) AlignmentProofSpine/Forgeability.lean8, 31, 43, 48 Field-agenda crosswalk AlignmentProofSpine/Field.leanAppendix B crosswalk
Try-it-out snippets Self-contained finite proofs and counterexamples, pre-linked toLean 4 Web . Add a file underformal/playgrounds/ and run npm run sync — URLs are generated automatically.
What Lean checks Three kinds of result appear throughout: proof local theorems,counterexample finite separations, andbridge empirical handoffs (MB1–MB10). Headline certification theorems depend on explicit bridge records — inspect with #print axioms in the repo.