{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:QPTD2IEWDUDBKXYAQAPVXLOSUY","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"b4bd49bb26ebd755b3e08fa17a1ada0fda008c13292780d6a2c641634de3c2c2","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.str-el","submitted_at":"1998-07-27T14:34:27Z","title_canon_sha256":"a99ee91bcf7645c75cf80b803c4ac3150a530b38c71f3809e3c28ab7e4e3333f"},"schema_version":"1.0","source":{"id":"cond-mat/9807355","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/9807355","created_at":"2026-07-04T14:23:10Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/9807355v1","created_at":"2026-07-04T14:23:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/9807355","created_at":"2026-07-04T14:23:10Z"},{"alias_kind":"pith_short_12","alias_value":"QPTD2IEWDUDB","created_at":"2026-07-04T14:23:10Z"},{"alias_kind":"pith_short_16","alias_value":"QPTD2IEWDUDBKXYA","created_at":"2026-07-04T14:23:10Z"},{"alias_kind":"pith_short_8","alias_value":"QPTD2IEW","created_at":"2026-07-04T14:23:10Z"}],"graph_snapshots":[{"event_id":"sha256:b4432b7d424ac667eb1cd4ab294c4f7c9fd9306601746dc71622bbf5c7b01841","target":"graph","created_at":"2026-07-04T14:23:10Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/cond-mat/9807355/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We propose a theoretical framework to describe the ladder systems. The N-chain Hubbard model has been studied within the Composite Operator Method. In this scheme of calculations the single-particle Green's function for any number of coupled chains is obtained by solving self-consistently a system of integral equations.","authors_text":"A. Avella (1), F. Mancini (1), India), Italy; (2) IMSC, Madras, M. M. Sanchez (1), R. Sridhar (2) ((1) University of Salerno","cross_cats":[],"headline":"","license":"","primary_cat":"cond-mat.str-el","submitted_at":"1998-07-27T14:34:27Z","title":"The N-Chain Hubbard model in the Composite Operator Method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/9807355","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:a8f3b976d5024d944348696c9e6fc0b539f6582f26b4c4c67be3f374d6778122","target":"record","created_at":"2026-07-04T14:23:10Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"b4bd49bb26ebd755b3e08fa17a1ada0fda008c13292780d6a2c641634de3c2c2","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.str-el","submitted_at":"1998-07-27T14:34:27Z","title_canon_sha256":"a99ee91bcf7645c75cf80b803c4ac3150a530b38c71f3809e3c28ab7e4e3333f"},"schema_version":"1.0","source":{"id":"cond-mat/9807355","kind":"arxiv","version":1}},"canonical_sha256":"83e63d20961d06155f00801f5badd2a621cd0167c3fcc1cfd02e9a912f7f475e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"83e63d20961d06155f00801f5badd2a621cd0167c3fcc1cfd02e9a912f7f475e","first_computed_at":"2026-07-04T14:23:10.766548Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T14:23:10.766548Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CIQddoZiq/BYeQH7sy250vpi2JdwOyb6MXpkgpKxqeK3YYWfP4wdL6D9V7YYbat56GDIjg2VesTUycKxO5+DBw==","signature_status":"signed_v1","signed_at":"2026-07-04T14:23:10.766965Z","signed_message":"canonical_sha256_bytes"},"source_id":"cond-mat/9807355","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a8f3b976d5024d944348696c9e6fc0b539f6582f26b4c4c67be3f374d6778122","sha256:b4432b7d424ac667eb1cd4ab294c4f7c9fd9306601746dc71622bbf5c7b01841"],"state_sha256":"d55ae904646a10b8c1de50577c1230054cb54a31b67ad600c8bb10a6941e4ced"}