{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:S4HT6VLXZCKBPHDVCUKXXHZ3Q6","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":"1fa3ef249e1a2d12e60113979ae7b1f7d538280c34802deab57639bb898b7408","cross_cats_sorted":["cs.CY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AI","submitted_at":"2016-02-23T04:33:05Z","title_canon_sha256":"d7053a0f34f600f63de2391e904c2ad82b6755855a1a815a0710cb5cc12c4305"},"schema_version":"1.0","source":{"id":"1602.07032","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.07032","created_at":"2026-05-18T01:12:43Z"},{"alias_kind":"arxiv_version","alias_value":"1602.07032v2","created_at":"2026-05-18T01:12:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.07032","created_at":"2026-05-18T01:12:43Z"},{"alias_kind":"pith_short_12","alias_value":"S4HT6VLXZCKB","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_16","alias_value":"S4HT6VLXZCKBPHDV","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_8","alias_value":"S4HT6VLX","created_at":"2026-05-18T12:30:41Z"}],"graph_snapshots":[{"event_id":"sha256:c37ea8c8e1485a0bf31ccdf56386564188522153fe186a7c4fd32a29529b6e10","target":"graph","created_at":"2026-05-18T01:12:43Z","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":"In the study of human learning, there is broad evidence that our ability to retain information improves with repeated exposure and decays with delay since last exposure. This plays a crucial role in the design of educational software, leading to a trade-off between teaching new material and reviewing what has already been taught. A common way to balance this trade-off is spaced repetition, which uses periodic review of content to improve long-term retention. Though spaced repetition is widely used in practice, e.g., in electronic flashcard software, there is little formal understanding of the ","authors_text":"Igor Labutov, Siddhartha Banerjee, Siddharth Reddy, Thorsten Joachims","cross_cats":["cs.CY"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AI","submitted_at":"2016-02-23T04:33:05Z","title":"Unbounded Human Learning: Optimal Scheduling for Spaced Repetition"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.07032","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":"sha256:2fbbf5e749185b7aa080dfc04d2ab648741cee30e472145fddc1eee147277f6d","target":"record","created_at":"2026-05-18T01:12:43Z","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":"1fa3ef249e1a2d12e60113979ae7b1f7d538280c34802deab57639bb898b7408","cross_cats_sorted":["cs.CY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AI","submitted_at":"2016-02-23T04:33:05Z","title_canon_sha256":"d7053a0f34f600f63de2391e904c2ad82b6755855a1a815a0710cb5cc12c4305"},"schema_version":"1.0","source":{"id":"1602.07032","kind":"arxiv","version":2}},"canonical_sha256":"970f3f5577c894179c7515157b9f3b8791946dd5a2684bae5690f78feda991f3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"970f3f5577c894179c7515157b9f3b8791946dd5a2684bae5690f78feda991f3","first_computed_at":"2026-05-18T01:12:43.175201Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:12:43.175201Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3UXqWzvCbPlSrhVZ2ZuSpqXzQn9ew+/iGBKDwwFcLw6Aa/zSkxGLL3cORAC30798isgpGeMnAuosEPQT7tw/Dg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:12:43.175561Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.07032","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2fbbf5e749185b7aa080dfc04d2ab648741cee30e472145fddc1eee147277f6d","sha256:c37ea8c8e1485a0bf31ccdf56386564188522153fe186a7c4fd32a29529b6e10"],"state_sha256":"960771571642786db699b214f1a5e6d155615667e61a8207dc6fb2d4aeebc16a"}