{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:BSTY6IJ4GRK4O6SH5WGQ5RM5HF","short_pith_number":"pith:BSTY6IJ4","canonical_record":{"source":{"id":"1803.10593","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.HO","submitted_at":"2018-03-24T13:59:06Z","cross_cats_sorted":[],"title_canon_sha256":"f1110ac8f45ee548b6e914897beb61ef71f823d3b9b872f2ecccaae4b5a2a98e","abstract_canon_sha256":"0f8390543786506f9036d5002907c6c4c2638237bb405f045ef74aa8e6ff6f55"},"schema_version":"1.0"},"canonical_sha256":"0ca78f213c3455c77a47ed8d0ec59d396085558a442776cb5c0445af3d868a7a","source":{"kind":"arxiv","id":"1803.10593","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.10593","created_at":"2026-05-18T00:09:35Z"},{"alias_kind":"arxiv_version","alias_value":"1803.10593v2","created_at":"2026-05-18T00:09:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.10593","created_at":"2026-05-18T00:09:35Z"},{"alias_kind":"pith_short_12","alias_value":"BSTY6IJ4GRK4","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"BSTY6IJ4GRK4O6SH","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"BSTY6IJ4","created_at":"2026-05-18T12:32:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:BSTY6IJ4GRK4O6SH5WGQ5RM5HF","target":"record","payload":{"canonical_record":{"source":{"id":"1803.10593","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.HO","submitted_at":"2018-03-24T13:59:06Z","cross_cats_sorted":[],"title_canon_sha256":"f1110ac8f45ee548b6e914897beb61ef71f823d3b9b872f2ecccaae4b5a2a98e","abstract_canon_sha256":"0f8390543786506f9036d5002907c6c4c2638237bb405f045ef74aa8e6ff6f55"},"schema_version":"1.0"},"canonical_sha256":"0ca78f213c3455c77a47ed8d0ec59d396085558a442776cb5c0445af3d868a7a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:09:35.836312Z","signature_b64":"E9p2LQ1WP3DPXK9NdXU2QWxXEOuG7pduIOhckUoIPXuvNPulD2soS6Q5v4MoG67bh2/BbdU2+Tsjefcv7yJDAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0ca78f213c3455c77a47ed8d0ec59d396085558a442776cb5c0445af3d868a7a","last_reissued_at":"2026-05-18T00:09:35.835846Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:09:35.835846Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.10593","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:09:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EviUiyRtviVtL4YJXbDB0CXq4oqvGDIt1JSrKlgz0n/1q4NMYt9U7fz88XWl0M5fP5AnI9zuLT1aRgChaHHrAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T04:05:25.812236Z"},"content_sha256":"fb833b139942aa1cda8322eba7ee69a782d00a81369b6b0ca3d4212c29a09244","schema_version":"1.0","event_id":"sha256:fb833b139942aa1cda8322eba7ee69a782d00a81369b6b0ca3d4212c29a09244"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:BSTY6IJ4GRK4O6SH5WGQ5RM5HF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Mathematical Encounters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.HO","authors_text":"Jorge Sotomayor","submitted_at":"2018-03-24T13:59:06Z","abstract_excerpt":"This evocative essay focuses on mathematical activities witnessed by the author along 1962-64 at IMPA. The list of research problems proposed in September 1962 by Mauricio Peixoto at the Seminar on the Qualitative Theory of Differential Equations is pointed out as a landmark for the beginning of the systematic research in the Qualitative Theory of Differential Equations and Dynamical Systems in Brazil."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.10593","kind":"arxiv","version":2},"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":"2026-05-18T00:09:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"f5ls154jLQ115xIYNOqzU7kjgOe9i/zykIZ5Tnb9FXTzG8jzG77yT4D1+UWhJRpSrNywf1MxzlSyAjzhdp99AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T04:05:25.812866Z"},"content_sha256":"f6711e863254a8893923cbe4417217f38853537ba5a83383c8ae8f14ffcfb942","schema_version":"1.0","event_id":"sha256:f6711e863254a8893923cbe4417217f38853537ba5a83383c8ae8f14ffcfb942"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BSTY6IJ4GRK4O6SH5WGQ5RM5HF/bundle.json","state_url":"https://pith.science/pith/BSTY6IJ4GRK4O6SH5WGQ5RM5HF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BSTY6IJ4GRK4O6SH5WGQ5RM5HF/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":"2026-06-04T04:05:25Z","links":{"resolver":"https://pith.science/pith/BSTY6IJ4GRK4O6SH5WGQ5RM5HF","bundle":"https://pith.science/pith/BSTY6IJ4GRK4O6SH5WGQ5RM5HF/bundle.json","state":"https://pith.science/pith/BSTY6IJ4GRK4O6SH5WGQ5RM5HF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BSTY6IJ4GRK4O6SH5WGQ5RM5HF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:BSTY6IJ4GRK4O6SH5WGQ5RM5HF","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":"0f8390543786506f9036d5002907c6c4c2638237bb405f045ef74aa8e6ff6f55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.HO","submitted_at":"2018-03-24T13:59:06Z","title_canon_sha256":"f1110ac8f45ee548b6e914897beb61ef71f823d3b9b872f2ecccaae4b5a2a98e"},"schema_version":"1.0","source":{"id":"1803.10593","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.10593","created_at":"2026-05-18T00:09:35Z"},{"alias_kind":"arxiv_version","alias_value":"1803.10593v2","created_at":"2026-05-18T00:09:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.10593","created_at":"2026-05-18T00:09:35Z"},{"alias_kind":"pith_short_12","alias_value":"BSTY6IJ4GRK4","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"BSTY6IJ4GRK4O6SH","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"BSTY6IJ4","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:f6711e863254a8893923cbe4417217f38853537ba5a83383c8ae8f14ffcfb942","target":"graph","created_at":"2026-05-18T00:09:35Z","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":"This evocative essay focuses on mathematical activities witnessed by the author along 1962-64 at IMPA. The list of research problems proposed in September 1962 by Mauricio Peixoto at the Seminar on the Qualitative Theory of Differential Equations is pointed out as a landmark for the beginning of the systematic research in the Qualitative Theory of Differential Equations and Dynamical Systems in Brazil.","authors_text":"Jorge Sotomayor","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.HO","submitted_at":"2018-03-24T13:59:06Z","title":"Mathematical Encounters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.10593","kind":"arxiv","version":2},"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:fb833b139942aa1cda8322eba7ee69a782d00a81369b6b0ca3d4212c29a09244","target":"record","created_at":"2026-05-18T00:09:35Z","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":"0f8390543786506f9036d5002907c6c4c2638237bb405f045ef74aa8e6ff6f55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.HO","submitted_at":"2018-03-24T13:59:06Z","title_canon_sha256":"f1110ac8f45ee548b6e914897beb61ef71f823d3b9b872f2ecccaae4b5a2a98e"},"schema_version":"1.0","source":{"id":"1803.10593","kind":"arxiv","version":2}},"canonical_sha256":"0ca78f213c3455c77a47ed8d0ec59d396085558a442776cb5c0445af3d868a7a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0ca78f213c3455c77a47ed8d0ec59d396085558a442776cb5c0445af3d868a7a","first_computed_at":"2026-05-18T00:09:35.835846Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:09:35.835846Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"E9p2LQ1WP3DPXK9NdXU2QWxXEOuG7pduIOhckUoIPXuvNPulD2soS6Q5v4MoG67bh2/BbdU2+Tsjefcv7yJDAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:09:35.836312Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.10593","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fb833b139942aa1cda8322eba7ee69a782d00a81369b6b0ca3d4212c29a09244","sha256:f6711e863254a8893923cbe4417217f38853537ba5a83383c8ae8f14ffcfb942"],"state_sha256":"4457e8e384d0dd8805e5fae4674a30220d474bfae5123b61db12527d596e003b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3RkZfoIOlrKCNntQFXrWLjS/A8A2BDccbfp0NJZS03NtVnANG0qPLeQU5NYZFl/PkVWNLYZAe1rNbvmAMrf5Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T04:05:25.816221Z","bundle_sha256":"771ce7a64046f255b650da89ef2a67aeb03abbe6c5a61091d2342937c7620585"}}