{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:L5MC4PZZZSCHMOTRM4ELM6MV6B","short_pith_number":"pith:L5MC4PZZ","canonical_record":{"source":{"id":"1604.07893","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.RA","submitted_at":"2016-04-27T00:15:57Z","cross_cats_sorted":["math.NA"],"title_canon_sha256":"cd55bd06b2c5687d481748982e2e266170ea700f425c3d3ef345e6258129b58e","abstract_canon_sha256":"3010225f976f765ae687de330f2db43065fd52ae8b24ed70b2ff919f3506dab7"},"schema_version":"1.0"},"canonical_sha256":"5f582e3f39cc84763a716708b67995f05aba7cd6c9a32d5192f7281dcdf81244","source":{"kind":"arxiv","id":"1604.07893","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.07893","created_at":"2026-05-18T01:16:08Z"},{"alias_kind":"arxiv_version","alias_value":"1604.07893v1","created_at":"2026-05-18T01:16:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.07893","created_at":"2026-05-18T01:16:08Z"},{"alias_kind":"pith_short_12","alias_value":"L5MC4PZZZSCH","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"L5MC4PZZZSCHMOTR","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"L5MC4PZZ","created_at":"2026-05-18T12:30:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:L5MC4PZZZSCHMOTRM4ELM6MV6B","target":"record","payload":{"canonical_record":{"source":{"id":"1604.07893","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.RA","submitted_at":"2016-04-27T00:15:57Z","cross_cats_sorted":["math.NA"],"title_canon_sha256":"cd55bd06b2c5687d481748982e2e266170ea700f425c3d3ef345e6258129b58e","abstract_canon_sha256":"3010225f976f765ae687de330f2db43065fd52ae8b24ed70b2ff919f3506dab7"},"schema_version":"1.0"},"canonical_sha256":"5f582e3f39cc84763a716708b67995f05aba7cd6c9a32d5192f7281dcdf81244","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:16:08.682391Z","signature_b64":"5MPCi/i8+7ptJ7IlqOKW9CFlJUB+cfqZTwAFs+o3b7mCn8+9VzfzgHixg4VVbKZ3Cs0yh1mUdiGZLp1DBCbXBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5f582e3f39cc84763a716708b67995f05aba7cd6c9a32d5192f7281dcdf81244","last_reissued_at":"2026-05-18T01:16:08.681641Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:16:08.681641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.07893","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":"2026-05-18T01:16:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jpMCOFOcS/E4qxX6cDkp/1VqYP8KqTU5UvnZ+NxjVVcECWYhXIIDuc/R4xorJ3HJUAuuUKLgdWxXqiaXUAFvDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T01:54:21.331689Z"},"content_sha256":"efebf90f6dd77b2db6e1949d2d84c404cfaf1f3ef1569f7436ca94f7ab8d909d","schema_version":"1.0","event_id":"sha256:efebf90f6dd77b2db6e1949d2d84c404cfaf1f3ef1569f7436ca94f7ab8d909d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:L5MC4PZZZSCHMOTRM4ELM6MV6B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Highly Efficient Computation of Generalized Inverse of a Matrix","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.NA"],"primary_cat":"math.RA","authors_text":"F. Soleymani, Liang Zhao, V.Y. Pan","submitted_at":"2016-04-27T00:15:57Z","abstract_excerpt":"We propose a hyperpower iteration for numerical computation of the outer generalized inverse of a matrix which achieves the 18th order of convergence by using only seven matrix multiplication per iteration loop. This is the record high efficiency for that computational task. The algorithm has a relatively mild numerical instability, and we stabilize it at the price of adding one extra matrix multiplication per iteration loop. This imlplies an efficiency index that significantly exceeds the known record for numerically stable iterations for this task. Our numerical tests cover a variety of exam"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.07893","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":"2026-05-18T01:16:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KK0OI5cVYtBqfGkGH1Tj9iW7MQDB8y6Lj7pWLPR8k4kUEyL0U7ei0vr6buy79ATdCdL+URmyz1nlZZNduMcYDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T01:54:21.332571Z"},"content_sha256":"bc5d11c0b26435dd70d1a832525fbe048a296c7bfdf1e535bfc04e39e2733652","schema_version":"1.0","event_id":"sha256:bc5d11c0b26435dd70d1a832525fbe048a296c7bfdf1e535bfc04e39e2733652"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/L5MC4PZZZSCHMOTRM4ELM6MV6B/bundle.json","state_url":"https://pith.science/pith/L5MC4PZZZSCHMOTRM4ELM6MV6B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/L5MC4PZZZSCHMOTRM4ELM6MV6B/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":"2026-06-08T01:54:21Z","links":{"resolver":"https://pith.science/pith/L5MC4PZZZSCHMOTRM4ELM6MV6B","bundle":"https://pith.science/pith/L5MC4PZZZSCHMOTRM4ELM6MV6B/bundle.json","state":"https://pith.science/pith/L5MC4PZZZSCHMOTRM4ELM6MV6B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/L5MC4PZZZSCHMOTRM4ELM6MV6B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:L5MC4PZZZSCHMOTRM4ELM6MV6B","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":"3010225f976f765ae687de330f2db43065fd52ae8b24ed70b2ff919f3506dab7","cross_cats_sorted":["math.NA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.RA","submitted_at":"2016-04-27T00:15:57Z","title_canon_sha256":"cd55bd06b2c5687d481748982e2e266170ea700f425c3d3ef345e6258129b58e"},"schema_version":"1.0","source":{"id":"1604.07893","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.07893","created_at":"2026-05-18T01:16:08Z"},{"alias_kind":"arxiv_version","alias_value":"1604.07893v1","created_at":"2026-05-18T01:16:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.07893","created_at":"2026-05-18T01:16:08Z"},{"alias_kind":"pith_short_12","alias_value":"L5MC4PZZZSCH","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"L5MC4PZZZSCHMOTR","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"L5MC4PZZ","created_at":"2026-05-18T12:30:29Z"}],"graph_snapshots":[{"event_id":"sha256:bc5d11c0b26435dd70d1a832525fbe048a296c7bfdf1e535bfc04e39e2733652","target":"graph","created_at":"2026-05-18T01:16:08Z","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 propose a hyperpower iteration for numerical computation of the outer generalized inverse of a matrix which achieves the 18th order of convergence by using only seven matrix multiplication per iteration loop. This is the record high efficiency for that computational task. The algorithm has a relatively mild numerical instability, and we stabilize it at the price of adding one extra matrix multiplication per iteration loop. This imlplies an efficiency index that significantly exceeds the known record for numerically stable iterations for this task. Our numerical tests cover a variety of exam","authors_text":"F. Soleymani, Liang Zhao, V.Y. Pan","cross_cats":["math.NA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.RA","submitted_at":"2016-04-27T00:15:57Z","title":"Highly Efficient Computation of Generalized Inverse of a Matrix"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.07893","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:efebf90f6dd77b2db6e1949d2d84c404cfaf1f3ef1569f7436ca94f7ab8d909d","target":"record","created_at":"2026-05-18T01:16:08Z","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":"3010225f976f765ae687de330f2db43065fd52ae8b24ed70b2ff919f3506dab7","cross_cats_sorted":["math.NA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.RA","submitted_at":"2016-04-27T00:15:57Z","title_canon_sha256":"cd55bd06b2c5687d481748982e2e266170ea700f425c3d3ef345e6258129b58e"},"schema_version":"1.0","source":{"id":"1604.07893","kind":"arxiv","version":1}},"canonical_sha256":"5f582e3f39cc84763a716708b67995f05aba7cd6c9a32d5192f7281dcdf81244","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f582e3f39cc84763a716708b67995f05aba7cd6c9a32d5192f7281dcdf81244","first_computed_at":"2026-05-18T01:16:08.681641Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:08.681641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5MPCi/i8+7ptJ7IlqOKW9CFlJUB+cfqZTwAFs+o3b7mCn8+9VzfzgHixg4VVbKZ3Cs0yh1mUdiGZLp1DBCbXBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:08.682391Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.07893","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:efebf90f6dd77b2db6e1949d2d84c404cfaf1f3ef1569f7436ca94f7ab8d909d","sha256:bc5d11c0b26435dd70d1a832525fbe048a296c7bfdf1e535bfc04e39e2733652"],"state_sha256":"a3605d79cd6db93231d7823272fd62d844dd1c9866a8c514e024baacdee5c992"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3Xn3m4OvsRKFPE5MrjGB5A74ecclGQYWm9xTJco+HXIlNecLI+bQfKWP73Qn84q3REX8rnOflfCjPYyM74wuCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T01:54:21.336699Z","bundle_sha256":"ecd8036d8a54eb2bfac66abda60bbc87ad17d201b2fed9672cd030e1cd3c19e4"}}