{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:74RIGSVSUVA5Q5KLKKIITGKODW","short_pith_number":"pith:74RIGSVS","canonical_record":{"source":{"id":"1801.03108","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-01-09T19:06:28Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"0216016361c378e8f49e8999037455fc9e5469bb87af7b37b1ba8c8d403bea21","abstract_canon_sha256":"dac673589d816ff35b094cbf9a0ebb363dcf532219032798319a5e0ff8bac566"},"schema_version":"1.0"},"canonical_sha256":"ff22834ab2a541d8754b529089994e1d8c366a477d4b58058ebdb7e34637f088","source":{"kind":"arxiv","id":"1801.03108","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.03108","created_at":"2026-05-18T00:21:06Z"},{"alias_kind":"arxiv_version","alias_value":"1801.03108v1","created_at":"2026-05-18T00:21:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.03108","created_at":"2026-05-18T00:21:06Z"},{"alias_kind":"pith_short_12","alias_value":"74RIGSVSUVA5","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"74RIGSVSUVA5Q5KL","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"74RIGSVS","created_at":"2026-05-18T12:32:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:74RIGSVSUVA5Q5KLKKIITGKODW","target":"record","payload":{"canonical_record":{"source":{"id":"1801.03108","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-01-09T19:06:28Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"0216016361c378e8f49e8999037455fc9e5469bb87af7b37b1ba8c8d403bea21","abstract_canon_sha256":"dac673589d816ff35b094cbf9a0ebb363dcf532219032798319a5e0ff8bac566"},"schema_version":"1.0"},"canonical_sha256":"ff22834ab2a541d8754b529089994e1d8c366a477d4b58058ebdb7e34637f088","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:21:06.791408Z","signature_b64":"LQngs9Mpj4TfXSXPHLOA0dfA5QUg7jUI5QkHEx4DXwz7qfO++I71YJZe5+L8Z7G/gCcrCMZBelA6fuem71jiBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ff22834ab2a541d8754b529089994e1d8c366a477d4b58058ebdb7e34637f088","last_reissued_at":"2026-05-18T00:21:06.791006Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:21:06.791006Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.03108","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:21:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7auPE1PwUF0urepGmGI3ij30BaSnpSY9uvp5CR1Rg6tn42wPryK0MqnknRmGKO1c0hdEmrolBgxBU00oExFSAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T09:55:57.679141Z"},"content_sha256":"90e3f9430c142726f4a552d4c4a3a62683737ee004b909d1b8039a7ee8b8f64b","schema_version":"1.0","event_id":"sha256:90e3f9430c142726f4a552d4c4a3a62683737ee004b909d1b8039a7ee8b8f64b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:74RIGSVSUVA5Q5KLKKIITGKODW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Enforcing the Courant-Friedrichs-Lewy Condition in Explicitly Conservative Local Time Stepping Schemes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA"],"primary_cat":"physics.comp-ph","authors_text":"Andrey V. Kravtsov, Nickolay Y. Gnedin, Vadim A. Semenov","submitted_at":"2018-01-09T19:06:28Z","abstract_excerpt":"An optimally efficient explicit numerical scheme for solving fluid dynamics equations, or any other parabolic or hyperbolic system of partial differential equations, should allow local regions to advance in time with their own, locally constrained time steps. However, such a scheme can result in violation of the Courant-Friedrichs-Lewy (CFL) condition, which is manifestly non-local. Although the violations can be considered to be \"weak\" in a certain sense and the corresponding numerical solution may be stable, such calculation does not guarantee the correct propagation speed for arbitrary wave"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03108","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:21:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UsKtH34r0TEuKcT9rntRrbN4X2aD5LLyeMNDdr3k6VWcpskWuJppC13pNf4Xb/nzn0xrMFmCzJ16zWyVmFOoBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T09:55:57.679512Z"},"content_sha256":"242755be2bacba88660f8229031f6bc6bd188de8942b4f6e458ea329c5cf0662","schema_version":"1.0","event_id":"sha256:242755be2bacba88660f8229031f6bc6bd188de8942b4f6e458ea329c5cf0662"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/74RIGSVSUVA5Q5KLKKIITGKODW/bundle.json","state_url":"https://pith.science/pith/74RIGSVSUVA5Q5KLKKIITGKODW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/74RIGSVSUVA5Q5KLKKIITGKODW/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-26T09:55:57Z","links":{"resolver":"https://pith.science/pith/74RIGSVSUVA5Q5KLKKIITGKODW","bundle":"https://pith.science/pith/74RIGSVSUVA5Q5KLKKIITGKODW/bundle.json","state":"https://pith.science/pith/74RIGSVSUVA5Q5KLKKIITGKODW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/74RIGSVSUVA5Q5KLKKIITGKODW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:74RIGSVSUVA5Q5KLKKIITGKODW","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":"dac673589d816ff35b094cbf9a0ebb363dcf532219032798319a5e0ff8bac566","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-01-09T19:06:28Z","title_canon_sha256":"0216016361c378e8f49e8999037455fc9e5469bb87af7b37b1ba8c8d403bea21"},"schema_version":"1.0","source":{"id":"1801.03108","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.03108","created_at":"2026-05-18T00:21:06Z"},{"alias_kind":"arxiv_version","alias_value":"1801.03108v1","created_at":"2026-05-18T00:21:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.03108","created_at":"2026-05-18T00:21:06Z"},{"alias_kind":"pith_short_12","alias_value":"74RIGSVSUVA5","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"74RIGSVSUVA5Q5KL","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"74RIGSVS","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:242755be2bacba88660f8229031f6bc6bd188de8942b4f6e458ea329c5cf0662","target":"graph","created_at":"2026-05-18T00:21:06Z","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":"An optimally efficient explicit numerical scheme for solving fluid dynamics equations, or any other parabolic or hyperbolic system of partial differential equations, should allow local regions to advance in time with their own, locally constrained time steps. However, such a scheme can result in violation of the Courant-Friedrichs-Lewy (CFL) condition, which is manifestly non-local. Although the violations can be considered to be \"weak\" in a certain sense and the corresponding numerical solution may be stable, such calculation does not guarantee the correct propagation speed for arbitrary wave","authors_text":"Andrey V. Kravtsov, Nickolay Y. Gnedin, Vadim A. Semenov","cross_cats":["astro-ph.CO","astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-01-09T19:06:28Z","title":"Enforcing the Courant-Friedrichs-Lewy Condition in Explicitly Conservative Local Time Stepping Schemes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03108","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":"sha256:90e3f9430c142726f4a552d4c4a3a62683737ee004b909d1b8039a7ee8b8f64b","target":"record","created_at":"2026-05-18T00:21:06Z","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":"dac673589d816ff35b094cbf9a0ebb363dcf532219032798319a5e0ff8bac566","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-01-09T19:06:28Z","title_canon_sha256":"0216016361c378e8f49e8999037455fc9e5469bb87af7b37b1ba8c8d403bea21"},"schema_version":"1.0","source":{"id":"1801.03108","kind":"arxiv","version":1}},"canonical_sha256":"ff22834ab2a541d8754b529089994e1d8c366a477d4b58058ebdb7e34637f088","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ff22834ab2a541d8754b529089994e1d8c366a477d4b58058ebdb7e34637f088","first_computed_at":"2026-05-18T00:21:06.791006Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:21:06.791006Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LQngs9Mpj4TfXSXPHLOA0dfA5QUg7jUI5QkHEx4DXwz7qfO++I71YJZe5+L8Z7G/gCcrCMZBelA6fuem71jiBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:21:06.791408Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.03108","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:90e3f9430c142726f4a552d4c4a3a62683737ee004b909d1b8039a7ee8b8f64b","sha256:242755be2bacba88660f8229031f6bc6bd188de8942b4f6e458ea329c5cf0662"],"state_sha256":"9cedd02e254ed796e32113a7cf77d2a856c97838b4f54c0e972ebf2569aa0f3e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"riUiEkWRkWsFX0s8FO0ygzKW5WUD09qvwQmcUm/TrQ8pMnDyyw7FlapDR0W6lPt2iRsjYSVRjiu0Qci5g1SSDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T09:55:57.681692Z","bundle_sha256":"650a228da106fc591b09440fc707f6a4e91c6d35174d64409281ca91566c289f"}}