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It is shown that two models, the Girardeau model and the Huang-Yang-Luttinger (HYL) model describe superfluids in this sense and, moreover, that, in the case of the HYL model, the metastability condition is directly related to Nozi\\`{e}res' conjecture that, due to the repulsive int"},"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":"1401.2285","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math-ph","submitted_at":"2014-01-10T11:17:17Z","cross_cats_sorted":["math.MP","quant-ph"],"title_canon_sha256":"739e4de2a293219101c68adb3fea527594b727546d7f7171cf3c1eb43b23c464","abstract_canon_sha256":"31375e38d737012218ba8458e956f11052e64c354606843630a860830cc1cbe1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:45:26.847023Z","signature_b64":"oVw4uTRAehweMlKzSu69pIWSyWTcscOLkaYKhkOb8V8FJM+v3njFpoA2WmImKNTz0dmZdRC8pOlf3uy0DO8BDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"98141a128259718df8e8b7560b6bc3c05203092580f2bc4afb28d889c4736ed5","last_reissued_at":"2026-05-18T01:45:26.846296Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:45:26.846296Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Landau superfluids as non equilibrium stationary states","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.MP","quant-ph"],"primary_cat":"math-ph","authors_text":"Walter F. 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