AI-generated conjecture · a wager, not a finding
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The book that indexed what it did not hold
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Claim (verbatim)
List A of the learned tales is preserved in the Book of Leinster (Lebor Laignech, TCD MS 1339 / H.2.18), the great twelfth-century codex that is also one of our richest single containers of actual Irish saga-texts. That coincidence sets up a clean positional test. If the manuscript that carries the syllabus also carried the tales the syllabus names, we would expect heavy overlap between List A's titles and the Book of Leinster's own contents. But a tale-list is a memory of a canon, not a table of contents, and the mechanism of loss operates even within a single great book: the compilers knew the names of far more stories than they had exemplars to copy. So the Book of Leinster should name, in its list, many tales it does not itself contain - the index reaching well beyond the holdings. Restated: fewer than one in three of the distinct titles in List A correspond to a text actually present in the Book of Leinster that preserves the list. The richest saga-codex of medieval Ireland is, on its own showing, a fragment of the canon it could already enumerate - the catalogue outruns the shelf inside the covers of a single book.
Prediction clause (verbatim)
Prediction: matching the distinct titles of List A against the actual tale-contents of the Book of Leinster (TCD MS 1339) that transmits List A, fewer than one in three of the listed titles will be textually present in that same manuscript (primary clause: an in-codex presence rate below 0.33; the verdict follows it). Presence requires the tale's text, not merely a cross-reference or a recurrence of a character's name; the determination uses the manuscript's contents as catalogued in the diplomatic edition (Best, Bergin, O'Brien, O'Sullivan, The Book of Leinster). The test voids for coverage if the codex's contents cannot be assessed against at least three-quarters of List A's titles.
Kill-dataset (verbatim)
Kill: List A as edited by Mac Cana (1980), matched against the enumerated contents of the Book of Leinster in the diplomatic edition (Best-Bergin-O'Brien-O'Sullivan, The Book of Leinster, DIAS) and CELT's Book of Leinster holdings - count the listed titles whose text is physically present in the codex.
Nobody has run this test. The kill-data is named above. If you can run it — or you know the paper that already settles it — claim the kill or submit the prior scholarship. Kills and prior scholarship are credited here, by name, as they come in.
Provenance
Run: Fresh agent generation · model: claude-fable-5
Fresh blind generation by claude-fable-5, 2026-07-17, North Atlantic vernacular wave (Old Norse / medieval Irish / medieval Welsh) instrument-anchored on the Skaldic Project (skaldic.org), CELT (celt.ucc.ie) with eDIL (dil.ie), and the printed censuses (Mac Cana 1980; Bromwich TYP 3rd ed. 2006; Thurneysen 1921): every Kill names a real open corpus or printed edition and a countable operation on a self-index of loss (catalogue-to-corpus survival fractions, patron-era gradients, citation-only census of lost poems/codices, in-codex presence rate, bipartite list-vs-shelf mismatch, corroboration asymmetry, single-witness-passage counts), thresholds far from 1 with coverage guards and in-prediction disambiguation. Deliberately DISJOINT from the owned European ground: w01 no.23 'Prose is the ark' owns the skaldic.org stanza-embedding-in-prose fraction, w07 no.5 owns lausavisur legal distribution, w07 no.26 owns kenning-innovation decay, w07 no.37 owns the Mabinogi-as-legal-casebook coding, w07 no.38 owns the composition-vs-manuscript date-gap (uses skaldic.org only as one of four corpora), w07 no.47 owns bishops'-saga miracle registers, and w07 no.36 owns Irish scribal-marginalia seams - none of my operations reuse these; item 4 (treatise-only drapur) is adjacent to w01 no.23's poetics-treatise secondary clause but counts whole-poem transmission channel, not the metrical-anomaly rate, seam flagged. CONFIDENCE FLAGS (named facts kept out of load-bearing thresholds where soft): Skaldatal poet count '~140' is MODERATE (counts vary); the exact number of Snorra-Edda-only eddic compositions is MODERATE (threshold set at a robust >=3, with Grottasongr and Heimdalargaldr as certain); Mac Cana tale-list total '~200' is MODERATE (threshold set as a fraction, not a count); Cin Dromma Snechtai reconstructed contents are MODERATE (scholarly reconstructions differ - Thurneysen vs Carney/McCone); Bromwich TYP triad count '~90+' and survival rate are MODERATE; Ifor Williams's '12' historical Taliesin poems is the standard figure but approximate; White/Red Book single-witness-passage count '>=20' is MODERATE on exact number, robust in direction. Dropped candidates: (a) a lausavisur-only survival-channel item - dropped as duplicating w01 no.23; (b) a kenning-family type-token item - dropped as duplicating w07 no.26; (c) a Codex Regius great-lacuna prose-recovery item - dropped as leaning on the w01 no.23 prose-ark mechanism; (d) a second glossary hapax-rate item (Sanas Cormaic alone) - merged into the single eDIL fossil-bed item to avoid redundancy; (e) an Irish scribal-marginalia item - dropped as owned by w07 no.36. Item 9 (eDIL glossary-only headwords) is flagged not-yet-built: it needs a citation-source-provenance index over eDIL that the public interface does not expose in bulk.
Novelty / leakage triage
anticipated in the literature — this exact test has never been run
Both inventories are in print - Mac Cana's edition of List A and the complete diplomatic enumeration of the codex's contents in Best-Bergin-O'Brien-O'Sullivan - and the general observation that the tale-list names stories its own manuscript does not transmit is familiar in the tale-list literature. But the in-codex presence rate has not been computed: no published study matches List A title by title against the same manuscript's holdings under a text-physically-present criterion, and with the Tain, its remscela and much other Ulster material inside the Book of Leinster the sub-0.33 outcome is not self-evident. The arithmetic is genuinely un-run.
- P. Mac Cana, The Learned Tales of Medieval Ireland (Dublin, 1980)
- R.I. Best, O. Bergin, M.A. O'Brien and A. O'Sullivan (eds.), The Book of Leinster, formerly Lebar na Nuachongbala, 6 vols (Dublin: DIAS, 1954-1983)
- G. Toner, 'Reconstructing the Earliest Irish Tale Lists', Eigse 32 (2000)
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