DETERMINE was one-hop. C answers a member/subset query that holds by SOUND transitive
subsumption when direct entailment misses: member∘subset* and subset∘subset (the
Description-Logic is-a rules). 'Socrates is a man. All men are mortal. Is Socrates
mortal?' -> yes, as told.
wrong=0 hazard surfaced and closed: member∘member is NOT transitive (instance-of vs
subclass-of) — 'Socrates is a man. Man is a species.' does NOT entail 'Socrates is a
species'. That rule is NEVER an edge, so the fallacy is unreachable (bite-tested). The
reader's member/subset split (X is a Y vs all Xs are Ys) is exactly the instance-of/
subclass-of distinction that makes the included rules sound.
Mechanism: SEARCH-then-VERIFY. Reachability over the sound edges finds the chain, then
the proof_chain ROBDD verifies that chain's propositional entailment (O(path) premises).
Full O(n³) grounding into proof_chain was tried and rejected: it overruns the
canonicalizer's per-conjunct recursion, and transitive closure is reachability, not
general SAT. Search-then-verify scales (11-hop chain determines in ~2ms) and keeps the
sound+complete decider as the wrong=0 verifier + proof artifact.
subset is now a supported direct-entailment predicate (a told subset(a,b) answers it);
the other categoricals (disjoint/intersects/some_not) stay excluded. Two existing tests
updated accordingly (subset->ungrounded, disjoint stays unsupported_query).
When accrue_realized_knowledge is on and a question turn is Determined over realized
knowledge, the user-facing surface IS that answer (generate.determine.render_determination):
'Yes — as I was told, truth is a concept.' The realizer's articulation_surface is
RETAINED as evidence — the determination is a user-facing SELECTION (like the
unknown-domain gate), not a rewrite. An Undetermined turn keeps the default
articulation surface (the honest 'I don't know'); flag-off never takes this path.
Basis is rendered honestly: SPECULATIVE grounds read 'as I was told', never 'verified'
(D0 only asserts answer=True, so the surface is an affirmation — no fabricated or
asserted-False string). Selection only: no field op, no normalization, proposes no
learning (HITL untouched).
Updates docs/runtime_contracts.md selection policy + adds the contract test in the
same PR (per the surface-contract discipline).
First consumer of en_core_relational_predicates_v1: a fail-closed sibling reader
that maps '<A> is [the] <connective> <B>' onto the pack's closed predicate
vocabulary (parent_of, less_than, left_of, before_event, ...), producing a standard
Comprehension. realize_comprehension consumes it unchanged; determine's guard widens
from the single 'member' predicate to a CLOSED direct-entailment set (member + the
ground binary relational predicates), keeping categorical/propositional predicates
soundly excluded.
Direct entailment only — no transitive/symmetric/rule inference (symmetric-converse
questions are a sound-but-incomplete refusal, never a faked assertion). Only the
predicate is closed-vocabulary; arguments may be OOV. The pack is loaded explicitly,
not default-mounted.
wrong=0 bites: reader refuses non-template/negated/pack-absent surfaces; determine
asserts only on direct entailment and excludes categorical predicates.
The honest gear (roadmap Step 4). `determine(question: Comprehension | Refusal, ctx)`
answers a membership question ("Is X a Y?") ONLY from what the held self has already
REALIZED (R1a structural recall) — never from the field, an LLM, or absence.
Honesty (from the design review): every realizable record is SPECULATIVE, and
ADMISSIBLE_AS_EVIDENCE = {COHERENT}, so a determination grounded in SPECULATIVE records
carries `basis="as_told"` — "based on what I was told (unverified)", NEVER "verified".
Until COHERENT promotion exists (out of scope), D0 produces only as-told assertions or
typed `Undetermined` refusals. No estimation; no corpus mutation (teaching stays HITL
proposal-only).
Soundness (open-world, wrong=0): D0 asserts an answer ONLY on DIRECT structural
entailment by a realized fact; absence never refutes (so it never asserts a positive
answer from missing knowledge — it refuses). It asserts only `answer=True` on a direct
hit; it never asserts False. Negated questions and non-`member` queries are an explicit
`Undetermined` — D0 ships no entailment path the reader cannot exercise.
Tests (test_determine_d0.py, 8) BITE: present-but-non-entailing (a record about the
subject exists but not the asked relation) MUST refuse; the same question against a
fresh context with no realized fact flips Determined→Undetermined (the verdict is
entailment, not mere presence); the negated + unsupported-query refusals are exercised
via hand-built queries (the reader refuses them upstream, so a comprehend-based test
would pass vacuously). Independent of #593: reasons over R0/R1 `member` facts only.
