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Nonnegativity of the structure constants $\\beta^c_{a,b}$ in $\\mathfrak{P}_a \\mathfrak{P}_b = \\sum_c \\beta^c_{a,b} \\mathfrak{P}_c$ is known, but no Littlewood-Richardson-style enumerative rule has been available. We give such a rule: $\\beta^c_{a,b}$ counts pairs of forest RC graphs of forest-codes $a$ and $b$ whose lift product lands on a forest R"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2606.23876","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.CO","submitted_at":"2026-06-22T19:23:04Z","cross_cats_sorted":["math.AG","math.RT"],"title_canon_sha256":"b56aecbeefba77a883215a98792d837595f87779f7e0b789ecef9b57984780df","abstract_canon_sha256":"a18dbeaa3c5fde0040f60584dc75f46393dbbe6a3c8fc13dad0780aac9326a96"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-24T00:14:29.127817Z","signature_b64":"VnWC5PC1j6KZmC35VqKoycZfvepI4Q3iIG5gpz1irkZiijbQhQhVwSpJEZmLvlBbENnd+Er108X6hbW/C5LTBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"987d4fd1a2355cfae226227284106e25628d3d03938482635e9a2cd324af0b70","last_reissued_at":"2026-06-24T00:14:29.127445Z","signature_status":"signed_v1","first_computed_at":"2026-06-24T00:14:29.127445Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Littlewood-Richardson Rule for Forest Polynomials via the Schubert Bialgebra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.AG","math.RT"],"primary_cat":"math.CO","authors_text":"Matthew J. 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