1. Purpose

This document presents the epistemic invariants that underlie the NS-L6 architecture. These invariants define the boundaries of knowledge, inference, and responsibility across system layers. They complement the normative axioms of the Framework.

This appendix is informative but provides essential conceptual structure for analysts, auditors, and system designers.

2. Epistemic Invariants

Epistemic invariants constrain what may be known, reconstructed, or attributed by any actor or system component.

2.1 Invariant E1 — Non-Invertibility of Layers

No higher layer can reconstruct the internal state of a lower layer. This establishes the fundamental inference boundary across L0–L6.

2.2 Invariant E2 — Epistemic Locality

Knowledge is local to each layer. No layer has a globally valid epistemic view across all lower strata.

2.3 Invariant E3 — Observability Constraint

An actor may only form epistemic claims about states that are observable at that layer.

2.4 Invariant E4 — Controllability Constraint

Epistemic claims about responsibility require control over the relevant transitions.

2.5 Invariant E5 — No Cross-Layer Justification

Justifications for a decision in L6 cannot rely on inaccessible or unobservable computational states from L0–L3.

3. Epistemic Boundaries

Epistemic boundaries define what is permissible to infer within a responsibility-aligned system.

3.1 Downward Epistemic Barrier

No epistemic reconstruction of physical, computational, or model-internal state may be derived from higher-level output.

3.2 Upward Responsibility Barrier

Epistemic uncertainty at lower layers cannot be used to formulate responsibility at higher layers.

3.3 Epistemic Closure

A responsibility-bearing decision must be supported by a complete epistemic view at the corresponding layer (L5 or L6).

4. Relation to the NS-L6 Framework

The epistemic invariants provide the theoretical substrate for:

• the Axiom Set in Section 7 of the Framework,
• the Responsibility Mapping in Section 9,
• the Non-Invertibility constraints specified in Appendix A,
• the semantic rules in Appendix B.

They serve as the meta-level assumptions required for structural integrity of the standard.

5. End of Document