{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:FQIHQW2PTMBRDLISF6PCP6PCJH","short_pith_number":"pith:FQIHQW2P","canonical_record":{"source":{"id":"2005.05436","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2020-05-05T14:32:52Z","cross_cats_sorted":["math.OC"],"title_canon_sha256":"968433785cbdf91988b45476660501f1df4d189aef35c38843648371fbe854ed","abstract_canon_sha256":"3ce74ff9fefe537cec09eaed92aa7254050f49277a201a821282ca0e883aeb65"},"schema_version":"1.0"},"canonical_sha256":"2c10785b4f9b0311ad122f9e27f9e249cd7a580d6f31caf486dad747c2b4868f","source":{"kind":"arxiv","id":"2005.05436","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2005.05436","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"arxiv_version","alias_value":"2005.05436v2","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2005.05436","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"pith_short_12","alias_value":"FQIHQW2PTMBR","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"pith_short_16","alias_value":"FQIHQW2PTMBRDLIS","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"pith_short_8","alias_value":"FQIHQW2P","created_at":"2026-07-05T01:22:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:FQIHQW2PTMBRDLISF6PCP6PCJH","target":"record","payload":{"canonical_record":{"source":{"id":"2005.05436","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2020-05-05T14:32:52Z","cross_cats_sorted":["math.OC"],"title_canon_sha256":"968433785cbdf91988b45476660501f1df4d189aef35c38843648371fbe854ed","abstract_canon_sha256":"3ce74ff9fefe537cec09eaed92aa7254050f49277a201a821282ca0e883aeb65"},"schema_version":"1.0"},"canonical_sha256":"2c10785b4f9b0311ad122f9e27f9e249cd7a580d6f31caf486dad747c2b4868f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:22:45.993397Z","signature_b64":"NxwdSaF5pzrcgnBZHY2VrJInplAhuNM7CQKirhFQZpP+kacnQY8V6UXKZBGe1A28dDbjdsWIan8KQcnTvjy8AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c10785b4f9b0311ad122f9e27f9e249cd7a580d6f31caf486dad747c2b4868f","last_reissued_at":"2026-07-05T01:22:45.992913Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:22:45.992913Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2005.05436","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":"2026-07-05T01:22:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b83SuXhol2bRbEQ4Y9qnaspWtrVwcnqGs/fAAgNJ2hoSDc/N+9vm5MoiGw9ORKewJHYihTb1aS4Nk6i5kpH5AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T07:42:10.736909Z"},"content_sha256":"aa5fd7ecf9d059dcc32ce6a9e65dd1edb6d5d59736c4a4beffaba64f329a690c","schema_version":"1.0","event_id":"sha256:aa5fd7ecf9d059dcc32ce6a9e65dd1edb6d5d59736c4a4beffaba64f329a690c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:FQIHQW2PTMBRDLISF6PCP6PCJH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A new generation 99 line Matlab code for compliance Topology Optimization and its extension to 3D","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.OC"],"primary_cat":"cs.CE","authors_text":"Federico Ferrari, Ole Sigmund","submitted_at":"2020-05-05T14:32:52Z","abstract_excerpt":"Compact and efficient Matlab implementations of compliance Topology Optimization (TO) for 2D and 3D continua are given, consisting of 99 and 125 lines respectively. On discretizations ranging from $3\\cdot 10^{4}$ to $4.8\\cdot10^{5}$ elements, the 2D version, named top99neo, shows speedups from 2.55 to 5.5 times compared to the well-known top88 code (Andreassen-etal 2011). The 3D version, named top3D125, is the most compact and efficient Matlab implementation for 3D TO to date, showing a speedup of 1.9 times compared to the code of Amir-etal 2014, on a discretization with $2.2\\cdot10^{5}$ eleme"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2005.05436","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2005.05436/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T01:22:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pBDqQ0tRpCK7Mc/24mHPZ5tnUasswAeyQZ2JzgPJc1YlczcdgMPUNa7O8dmpPDvy7dwASxI4u5EvTLYTo4ISDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T07:42:10.737813Z"},"content_sha256":"70852ff60b358d809da641c8da8bab60101ce9d9349fe7c464159ecaf919bb7e","schema_version":"1.0","event_id":"sha256:70852ff60b358d809da641c8da8bab60101ce9d9349fe7c464159ecaf919bb7e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FQIHQW2PTMBRDLISF6PCP6PCJH/bundle.json","state_url":"https://pith.science/pith/FQIHQW2PTMBRDLISF6PCP6PCJH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FQIHQW2PTMBRDLISF6PCP6PCJH/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":"2026-08-04T07:42:10Z","links":{"resolver":"https://pith.science/pith/FQIHQW2PTMBRDLISF6PCP6PCJH","bundle":"https://pith.science/pith/FQIHQW2PTMBRDLISF6PCP6PCJH/bundle.json","state":"https://pith.science/pith/FQIHQW2PTMBRDLISF6PCP6PCJH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FQIHQW2PTMBRDLISF6PCP6PCJH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:FQIHQW2PTMBRDLISF6PCP6PCJH","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":"3ce74ff9fefe537cec09eaed92aa7254050f49277a201a821282ca0e883aeb65","cross_cats_sorted":["math.OC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2020-05-05T14:32:52Z","title_canon_sha256":"968433785cbdf91988b45476660501f1df4d189aef35c38843648371fbe854ed"},"schema_version":"1.0","source":{"id":"2005.05436","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2005.05436","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"arxiv_version","alias_value":"2005.05436v2","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2005.05436","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"pith_short_12","alias_value":"FQIHQW2PTMBR","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"pith_short_16","alias_value":"FQIHQW2PTMBRDLIS","created_at":"2026-07-05T01:22:45Z"},{"alias_kind":"pith_short_8","alias_value":"FQIHQW2P","created_at":"2026-07-05T01:22:45Z"}],"graph_snapshots":[{"event_id":"sha256:70852ff60b358d809da641c8da8bab60101ce9d9349fe7c464159ecaf919bb7e","target":"graph","created_at":"2026-07-05T01:22:45Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2005.05436/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Compact and efficient Matlab implementations of compliance Topology Optimization (TO) for 2D and 3D continua are given, consisting of 99 and 125 lines respectively. On discretizations ranging from $3\\cdot 10^{4}$ to $4.8\\cdot10^{5}$ elements, the 2D version, named top99neo, shows speedups from 2.55 to 5.5 times compared to the well-known top88 code (Andreassen-etal 2011). The 3D version, named top3D125, is the most compact and efficient Matlab implementation for 3D TO to date, showing a speedup of 1.9 times compared to the code of Amir-etal 2014, on a discretization with $2.2\\cdot10^{5}$ eleme","authors_text":"Federico Ferrari, Ole Sigmund","cross_cats":["math.OC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2020-05-05T14:32:52Z","title":"A new generation 99 line Matlab code for compliance Topology Optimization and its extension to 3D"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2005.05436","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:aa5fd7ecf9d059dcc32ce6a9e65dd1edb6d5d59736c4a4beffaba64f329a690c","target":"record","created_at":"2026-07-05T01:22:45Z","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":"3ce74ff9fefe537cec09eaed92aa7254050f49277a201a821282ca0e883aeb65","cross_cats_sorted":["math.OC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2020-05-05T14:32:52Z","title_canon_sha256":"968433785cbdf91988b45476660501f1df4d189aef35c38843648371fbe854ed"},"schema_version":"1.0","source":{"id":"2005.05436","kind":"arxiv","version":2}},"canonical_sha256":"2c10785b4f9b0311ad122f9e27f9e249cd7a580d6f31caf486dad747c2b4868f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2c10785b4f9b0311ad122f9e27f9e249cd7a580d6f31caf486dad747c2b4868f","first_computed_at":"2026-07-05T01:22:45.992913Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:22:45.992913Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NxwdSaF5pzrcgnBZHY2VrJInplAhuNM7CQKirhFQZpP+kacnQY8V6UXKZBGe1A28dDbjdsWIan8KQcnTvjy8AQ==","signature_status":"signed_v1","signed_at":"2026-07-05T01:22:45.993397Z","signed_message":"canonical_sha256_bytes"},"source_id":"2005.05436","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aa5fd7ecf9d059dcc32ce6a9e65dd1edb6d5d59736c4a4beffaba64f329a690c","sha256:70852ff60b358d809da641c8da8bab60101ce9d9349fe7c464159ecaf919bb7e"],"state_sha256":"e067cf058fd19e19490481379208928e1ab0cf0007606ca48d44843f904298d5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xxBWZpClLqFA1fId0slilei2VvArpFW/DDxluu0HE9CGyYZj5IEDSbpspfbC0vmJoUX74KT22auGL62aC0d7DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T07:42:10.742829Z","bundle_sha256":"042de00c7198665ef1f76cdc8eae6b621cd35e5ba93ac969cc8c1d12cb46c3ae"}}