{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:UOATK7LDK4S2GWJOVSOXNHJ54X","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":"df5ebb74194ed18c133340974325b01327d26f039f2c6a21c010c0625f21a626","cross_cats_sorted":["cs.LO"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CY","submitted_at":"2015-07-14T00:51:14Z","title_canon_sha256":"449a0eaae391f843313337514659ba08facf691df47a4a7135f29bb2a5e2ef19"},"schema_version":"1.0","source":{"id":"1507.03671","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.03671","created_at":"2026-05-18T01:36:57Z"},{"alias_kind":"arxiv_version","alias_value":"1507.03671v1","created_at":"2026-05-18T01:36:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.03671","created_at":"2026-05-18T01:36:57Z"},{"alias_kind":"pith_short_12","alias_value":"UOATK7LDK4S2","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"UOATK7LDK4S2GWJO","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"UOATK7LD","created_at":"2026-05-18T12:29:44Z"}],"graph_snapshots":[{"event_id":"sha256:a1ab3c06411deba428a0e459ccbd32a7f1e9b300a50f8c0b83d6580ed61a6e5e","target":"graph","created_at":"2026-05-18T01:36:57Z","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":"LogEx is a learning environment that supports students in rewriting propositional logical formulae, using standard equivalences. We organized a pilot study to prepare a large scale evaluation of the learning environment. In this paper we describe this study, together with the outcomes, which teach us valuable lessons for the large scale evaluation.","authors_text":"Bastiaan Heeren, Johan Jeuring, Josje Lodder","cross_cats":["cs.LO"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CY","submitted_at":"2015-07-14T00:51:14Z","title":"A pilot study of the use of LogEx, lessons learned"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.03671","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":"sha256:214781fac8886593c10f900e05c76481897b574ef0aa295bb9cc1e7e901539ae","target":"record","created_at":"2026-05-18T01:36:57Z","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":"df5ebb74194ed18c133340974325b01327d26f039f2c6a21c010c0625f21a626","cross_cats_sorted":["cs.LO"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CY","submitted_at":"2015-07-14T00:51:14Z","title_canon_sha256":"449a0eaae391f843313337514659ba08facf691df47a4a7135f29bb2a5e2ef19"},"schema_version":"1.0","source":{"id":"1507.03671","kind":"arxiv","version":1}},"canonical_sha256":"a381357d635725a3592eac9d769d3de5d75ad9bf7916813b3074a87abe1fb017","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a381357d635725a3592eac9d769d3de5d75ad9bf7916813b3074a87abe1fb017","first_computed_at":"2026-05-18T01:36:57.641458Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:36:57.641458Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"syehlivSoRW4b/Mf6QL2uNhV5RBNypL5CDGDwPeo0LLIFDVlHk0TwsYv0K2TSDaDhCELE9Yu9ZSuZYJlUOoPCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:36:57.642056Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.03671","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:214781fac8886593c10f900e05c76481897b574ef0aa295bb9cc1e7e901539ae","sha256:a1ab3c06411deba428a0e459ccbd32a7f1e9b300a50f8c0b83d6580ed61a6e5e"],"state_sha256":"733de44610d7b5dd2068fcebcac6967ee8ffa0d2b0a3c5f59e6df58807fa22ae"}