{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:CWBKPLWKZRLZCYP2VNHLAG6NCB","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":"e67352ca12f122fb1a07022da6881b730cf50804bf77c4952c04cc6dc2cd056f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2018-04-17T00:13:24Z","title_canon_sha256":"37e72926f834c968569fdf7e0a6a5fd817cd4c241a61f39c17fc7505e0242550"},"schema_version":"1.0","source":{"id":"1804.05989","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.05989","created_at":"2026-05-18T00:18:22Z"},{"alias_kind":"arxiv_version","alias_value":"1804.05989v1","created_at":"2026-05-18T00:18:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.05989","created_at":"2026-05-18T00:18:22Z"},{"alias_kind":"pith_short_12","alias_value":"CWBKPLWKZRLZ","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"CWBKPLWKZRLZCYP2","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"CWBKPLWK","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:e5c024a4adf27292f21e42446a9ac57756d8d68466f75c405a4aace990feb99a","target":"graph","created_at":"2026-05-18T00:18:22Z","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"},"paper":{"abstract_excerpt":"We present a method for automatic inference of conditions on the initial states of a program that guarantee that the safety assertions in the program are not violated. Constrained Horn clauses (CHCs) are used to model the program and assertions in a uniform way, and we use standard abstract interpretations to derive an over-approximation of the set of unsafe initial states. The precondition then is the constraint corresponding to the complement of that set, under-approximating the set of safe initial states. This idea of complementation is not new, but previous attempts to exploit it have suff","authors_text":"Bishoksan Kafle, Graeme Gange, Harald Sondergaard, John P. Gallagher, Peter J. Stuckey, Peter Schachte","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2018-04-17T00:13:24Z","title":"An iterative approach to precondition inference using constrained Horn clauses"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.05989","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:c208cdd3e190ccf7bfddc0bd1582989a01f6d0c4ced2ce5ba513a55d7236c8d4","target":"record","created_at":"2026-05-18T00:18:22Z","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":"e67352ca12f122fb1a07022da6881b730cf50804bf77c4952c04cc6dc2cd056f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2018-04-17T00:13:24Z","title_canon_sha256":"37e72926f834c968569fdf7e0a6a5fd817cd4c241a61f39c17fc7505e0242550"},"schema_version":"1.0","source":{"id":"1804.05989","kind":"arxiv","version":1}},"canonical_sha256":"1582a7aecacc579161faab4eb01bcd105d9f26c5a365827b6b95445a8eb1cd41","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1582a7aecacc579161faab4eb01bcd105d9f26c5a365827b6b95445a8eb1cd41","first_computed_at":"2026-05-18T00:18:22.124178Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:18:22.124178Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AKV3BPYfTnxGSWnG4LJsE/VGoTtaJePuTTlvjXcJuT9oPGIyMQ/vYgVnI6LdxoG0zDRH2orBMoILxkR7dUUUCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:18:22.124803Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.05989","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c208cdd3e190ccf7bfddc0bd1582989a01f6d0c4ced2ce5ba513a55d7236c8d4","sha256:e5c024a4adf27292f21e42446a9ac57756d8d68466f75c405a4aace990feb99a"],"state_sha256":"8b3456c8b0c0ea432811f1784ac2e0b755ad486aa64cf177d6b933e67d06767e"}