{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2014:JCHFYJEIDK6VKRQAVVUHFCOMSV","short_pith_number":"pith:JCHFYJEI","schema_version":"1.0","canonical_sha256":"488e5c24881abd554600ad687289cc954159b88ea3f0a1f61e7ddaf259c573ce","source":{"kind":"arxiv","id":"1402.2008","version":1},"attestation_state":"computed","paper":{"title":"Entropy in Dimension One","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.DS","authors_text":"William Thurston","submitted_at":"2014-02-09T23:47:18Z","abstract_excerpt":"This paper completely classifies which numbers arise as the topological entropy associated to postcritically finite self-maps of the unit interval. Specifically, a positive real number h is the topological entropy of a postcritically finite self-map of the unit interval if and only if exp(h) is an algebraic integer that is at least as large as the absolute value of any of the conjugates of exp(h); that is, if exp(h) is a weak Perron number. The postcritically finite map may be chosen to be a polynomial all of whose critical points are in the interval (0,1). This paper also proves that the weak"},"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":"1402.2008","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.DS","submitted_at":"2014-02-09T23:47:18Z","cross_cats_sorted":[],"title_canon_sha256":"bce93e032eb77d62ee9138d9f282cd954c543cd837fc2644ed6f822fd7403e76","abstract_canon_sha256":"cb4a11e0d1a7c78b266c41af0ed1470b1e5f96a937d53bd761cef31f89e769c6"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:59:32.710262Z","signature_b64":"O0jPyVFQ/puY4uaEuL5POipwzkPg5k9ByZ8QCYnnI8zZNENDKVb7NykHuceoMKD4Tk9/kcoJ+uIiDdSKmzgzDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"488e5c24881abd554600ad687289cc954159b88ea3f0a1f61e7ddaf259c573ce","last_reissued_at":"2026-05-18T02:59:32.709431Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:59:32.709431Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Entropy in Dimension One","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.DS","authors_text":"William Thurston","submitted_at":"2014-02-09T23:47:18Z","abstract_excerpt":"This paper completely classifies which numbers arise as the topological entropy associated to postcritically finite self-maps of the unit interval. Specifically, a positive real number h is the topological entropy of a postcritically finite self-map of the unit interval if and only if exp(h) is an algebraic integer that is at least as large as the absolute value of any of the conjugates of exp(h); that is, if exp(h) is a weak Perron number. The postcritically finite map may be chosen to be a polynomial all of whose critical points are in the interval (0,1). This paper also proves that the weak"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.2008","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1402.2008","created_at":"2026-05-18T02:59:32.709590+00:00"},{"alias_kind":"arxiv_version","alias_value":"1402.2008v1","created_at":"2026-05-18T02:59:32.709590+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.2008","created_at":"2026-05-18T02:59:32.709590+00:00"},{"alias_kind":"pith_short_12","alias_value":"JCHFYJEIDK6V","created_at":"2026-05-18T12:28:33.132498+00:00"},{"alias_kind":"pith_short_16","alias_value":"JCHFYJEIDK6VKRQA","created_at":"2026-05-18T12:28:33.132498+00:00"},{"alias_kind":"pith_short_8","alias_value":"JCHFYJEI","created_at":"2026-05-18T12:28:33.132498+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/JCHFYJEIDK6VKRQAVVUHFCOMSV","json":"https://pith.science/pith/JCHFYJEIDK6VKRQAVVUHFCOMSV.json","graph_json":"https://pith.science/api/pith-number/JCHFYJEIDK6VKRQAVVUHFCOMSV/graph.json","events_json":"https://pith.science/api/pith-number/JCHFYJEIDK6VKRQAVVUHFCOMSV/events.json","paper":"https://pith.science/paper/JCHFYJEI"},"agent_actions":{"view_html":"https://pith.science/pith/JCHFYJEIDK6VKRQAVVUHFCOMSV","download_json":"https://pith.science/pith/JCHFYJEIDK6VKRQAVVUHFCOMSV.json","view_paper":"https://pith.science/paper/JCHFYJEI","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1402.2008&json=true","fetch_graph":"https://pith.science/api/pith-number/JCHFYJEIDK6VKRQAVVUHFCOMSV/graph.json","fetch_events":"https://pith.science/api/pith-number/JCHFYJEIDK6VKRQAVVUHFCOMSV/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/JCHFYJEIDK6VKRQAVVUHFCOMSV/action/timestamp_anchor","attest_storage":"https://pith.science/pith/JCHFYJEIDK6VKRQAVVUHFCOMSV/action/storage_attestation","attest_author":"https://pith.science/pith/JCHFYJEIDK6VKRQAVVUHFCOMSV/action/author_attestation","sign_citation":"https://pith.science/pith/JCHFYJEIDK6VKRQAVVUHFCOMSV/action/citation_signature","submit_replication":"https://pith.science/pith/JCHFYJEIDK6VKRQAVVUHFCOMSV/action/replication_record"}},"created_at":"2026-05-18T02:59:32.709590+00:00","updated_at":"2026-05-18T02:59:32.709590+00:00"}