{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:P5DPGATAER3NGEONDRZ7BOKPO2","short_pith_number":"pith:P5DPGATA","schema_version":"1.0","canonical_sha256":"7f46f302602476d311cd1c73f0b94f7697c115f44f480f487d15acfafae81b1c","source":{"kind":"arxiv","id":"1804.00235","version":3},"attestation_state":"computed","paper":{"title":"What is Nonreciprocity?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Andrea Al\\`u, Christophe Caloz, Dimitrios Sounas, Karim Achouri, Sergei Tretyakov, Zo\\'e-Lise Deck-L\\'eger","submitted_at":"2018-04-01T00:50:58Z","abstract_excerpt":"This paper aims at providing a global perspective on electromagnetic nonreciprocity and clarifying confusions that arose in the recent developments of the field. It provides a general definition of nonreciprocity and classifies nonreciprocal systems according to their linear time-invariant (LTI), linear time-variant (LTV) or nonlinear nonreciprocal natures. The theory of nonlinear systems is established on the foundation of the concepts of time reversal, time-reversal symmetry, time-reversal symmetry breaking and related Onsager- Casimir relations. Special attention is given to LTI systems, as"},"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":"1804.00235","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-01T00:50:58Z","cross_cats_sorted":[],"title_canon_sha256":"500e97b5107a8f0d1b05600a2fc03655631c2714c745ff4ddb59b5652ae4c589","abstract_canon_sha256":"8a5f3aab7dc505ec8e3d178832cf1c703e6343b8be215c0ac073dd3dc07d5fcd"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:03:49.266075Z","signature_b64":"KjMviW1aaJ5pKsM0mECMboErmm9WCP1lx/PC226JM7qPvavYR9XhY7HaSp+uTihKSpzpXpbtmPatuvb6Q97iDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7f46f302602476d311cd1c73f0b94f7697c115f44f480f487d15acfafae81b1c","last_reissued_at":"2026-05-18T00:03:49.265450Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:03:49.265450Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"What is Nonreciprocity?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Andrea Al\\`u, Christophe Caloz, Dimitrios Sounas, Karim Achouri, Sergei Tretyakov, Zo\\'e-Lise Deck-L\\'eger","submitted_at":"2018-04-01T00:50:58Z","abstract_excerpt":"This paper aims at providing a global perspective on electromagnetic nonreciprocity and clarifying confusions that arose in the recent developments of the field. It provides a general definition of nonreciprocity and classifies nonreciprocal systems according to their linear time-invariant (LTI), linear time-variant (LTV) or nonlinear nonreciprocal natures. The theory of nonlinear systems is established on the foundation of the concepts of time reversal, time-reversal symmetry, time-reversal symmetry breaking and related Onsager- Casimir relations. Special attention is given to LTI systems, as"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.00235","kind":"arxiv","version":3},"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":"1804.00235","created_at":"2026-05-18T00:03:49.265538+00:00"},{"alias_kind":"arxiv_version","alias_value":"1804.00235v3","created_at":"2026-05-18T00:03:49.265538+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.00235","created_at":"2026-05-18T00:03:49.265538+00:00"},{"alias_kind":"pith_short_12","alias_value":"P5DPGATAER3N","created_at":"2026-05-18T12:32:43.782077+00:00"},{"alias_kind":"pith_short_16","alias_value":"P5DPGATAER3NGEON","created_at":"2026-05-18T12:32:43.782077+00:00"},{"alias_kind":"pith_short_8","alias_value":"P5DPGATA","created_at":"2026-05-18T12:32:43.782077+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/P5DPGATAER3NGEONDRZ7BOKPO2","json":"https://pith.science/pith/P5DPGATAER3NGEONDRZ7BOKPO2.json","graph_json":"https://pith.science/api/pith-number/P5DPGATAER3NGEONDRZ7BOKPO2/graph.json","events_json":"https://pith.science/api/pith-number/P5DPGATAER3NGEONDRZ7BOKPO2/events.json","paper":"https://pith.science/paper/P5DPGATA"},"agent_actions":{"view_html":"https://pith.science/pith/P5DPGATAER3NGEONDRZ7BOKPO2","download_json":"https://pith.science/pith/P5DPGATAER3NGEONDRZ7BOKPO2.json","view_paper":"https://pith.science/paper/P5DPGATA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1804.00235&json=true","fetch_graph":"https://pith.science/api/pith-number/P5DPGATAER3NGEONDRZ7BOKPO2/graph.json","fetch_events":"https://pith.science/api/pith-number/P5DPGATAER3NGEONDRZ7BOKPO2/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/P5DPGATAER3NGEONDRZ7BOKPO2/action/timestamp_anchor","attest_storage":"https://pith.science/pith/P5DPGATAER3NGEONDRZ7BOKPO2/action/storage_attestation","attest_author":"https://pith.science/pith/P5DPGATAER3NGEONDRZ7BOKPO2/action/author_attestation","sign_citation":"https://pith.science/pith/P5DPGATAER3NGEONDRZ7BOKPO2/action/citation_signature","submit_replication":"https://pith.science/pith/P5DPGATAER3NGEONDRZ7BOKPO2/action/replication_record"}},"created_at":"2026-05-18T00:03:49.265538+00:00","updated_at":"2026-05-18T00:03:49.265538+00:00"}