Closes the two skipped null-preservation tests and the architectural
gap behind them. In CGA, null vectors represent Euclidean points;
under a conformal transformation a point must map to a point —
applying a versor sandwich to a null vector must preserve null
property. The previous implementation forced everything onto the
unit-versor shell, which is correct for field-state propagation but
wrong for geometric point input.
Implementation
- algebra/versor.py: new `_input_is_null(F)` checks `cga_inner(F,F) ≈ 0`;
`versor_apply` routes null inputs around `_close_applied_versor`
and returns the raw sandwich V·F·rev(V), which algebraically
preserves null property. Non-null inputs unchanged.
- core-rs/src/versor.rs: `versor_apply_closed_f64` gains the same
null-check branch via `input_is_null_f64`. ADR-0020 parity
preserved (8/8 versor_apply bit-identity tests still pass).
Test changes
- tests/test_architectural_invariants.py::TestINV06NullConePreservation::
test_versor_apply_preserves_null_property — un-skipped, passes.
- tests/test_rust_backend.py::test_rust_versor_apply_preserves_null_vectors
— un-skipped, passes.
- tests/test_versor_closure.py::test_versor_apply_closes_null_like_field_
results_for_runtime_contract — renamed to
test_versor_apply_preserves_null_property_for_null_inputs and
rewritten to assert the now-correct semantics (null in → null out).
The old contract over-specified closure for null inputs and
contradicted the architectural invariant; that's what kept the
invariant test skipped.
Stale gap docs updated
- inference_closure / cross_domain_transfer / multi_step_reasoning
gaps.md now lead with a resolution block: lanes pass at 100% on
both splits after the typed operators (transitive_walk,
multi_relation_walk, path_recall in generate/operators.py) +
pipeline wiring (_maybe_transitive_walk + _fold_walk_into_surface)
landed. The historic findings are preserved below for traceability.
- compositionality gaps.md: partial resolution — recall up from
6.25% to 68.75%; overall_pass True; residual ~30% miss requires
a relation-aware `compose_relations` operator (v2 follow-on).
Lane health unchanged: algebra 132, smoke 55, runtime 19, teaching 17,
packs 6, cognition 103. Cognition eval 100%. Four formerly-"blocked"
reasoning lanes confirmed 100% / overall_pass=True end-to-end.
First Phase 3 lane. Scores whether CORE can derive entailments that
were not directly asserted, given a chain of premises taught through
the correction loop. Five transitive relation patterns drawn from
en_core_cognition_v1:
transitive_is A is B; B is C -> What is A?
transitive_precedes A precedes B; B precedes C -> What does A precede?
transitive_grounds A grounds B; B grounds C -> What does A ground?
transitive_causes A causes B; B causes C -> What does A cause?
transitive_belongs_to A belongs_to B; B belongs_to C -> Where does A belong?
Pass = expected entailment token appears in probe response surface
or walk surface (M1 or M2) AND every premise stored (M3) AND
trace_hash deterministic across two fresh runs (M4).
Results:
split n derived stored replay overall_pass
public/v1 20 0.0 1.0 1.0 False
holdouts/v1 12 0.0 1.0 1.0 False
This is the expected honest failure per docs/capability_roadmap.md
Phase 3. Foundation guarantees from Phase 2 (storage + replay) hold
at this depth; the inference-closure step itself does not yet exist
in CORE. The lane scores exactly the gap.
Concrete trace recorded in gaps.md: for premises 'wisdom is light',
'light is truth', probe 'What is wisdom?' returns the template
'wisdom is defined as ...' — vault retrieves 9 entries including
both premises, but the realizer emits a definition stub instead of
a derivation.
Architectural gaps filed (evals/inference_closure/gaps.md):
Gap 1. generate/graph_planner.py has no transitive composition —
plan_articulation picks a single node; there is no chained
relation walk that produces a derived node from premises.
Gap 2. field/propagate.py has no derivable-but-not-asserted recall
path — vault retrieval is direct CGA inner product; no
path-recall operator over relation-typed edges.
Both gaps are v2 engineering candidates and may share an
implementation surface. The lane is permanent regression evidence
of what specifically is missing.
Includes:
- contract.md: pass criteria, anti-overfitting note, sub-metric
definitions, calibration approach.
- runner.py: parallel, fresh-pipeline-per-case, M1-M4 scoring,
two-run replay-determinism check.
- dev/cases.jsonl (5), public/v1 (20), holdouts/v1 (12) — disjoint
entity sets, all five patterns covered.
- baselines/v1_structural_zero.json: frontier LLMs do not emit
the typed signals by construction.
- gaps.md: full architectural finding, engineering shapes for v2.
CLI suites smoke / cognition / teaching pass; no regression on
Phase 2 work.
Shay