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Cubic-fourfold rationality scope audit
Family 054: Irrational cubic fourfolds with Hodge-theoretic and categorical K3 associations. First application triage, 9 October 2026 Australia/Brisbane.
Problem and potential new use
Separate irrationality claims for very general large-discriminant cubic fourfolds from categorical or Hodge association with a K3 surface.
Applicability and commercial boundary
The threshold is ineffective and very-general assumptions exclude a universal finite rationality classifier.
Initial business decision
Research reference or conditional symbolic/verification engineering. No recurring buyer need, practical implementation or profitability has been demonstrated. Defer a standalone commercial product until a constructive example and a measurable workflow improvement exist. These records also identify unsupported inferences that an evidence platform could flag.
Next verification action
Inspect whether any explicit discriminant threshold or computable instance survives the proof.
Evidence scope
The repository catalog statement was individually read. Main-paper construction, effectiveness and selected formal-scope comparison remain queued for this record. No independent Lean verification was run. Source revision fd4aeeb2ee4fc729c18d98444fed42fd0529eeeb. See source metadata.