{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:QO2C2J2J5XT4N5ZSWEQRL7UQPG","short_pith_number":"pith:QO2C2J2J","canonical_record":{"source":{"id":"1208.3971","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.CA","submitted_at":"2012-08-20T10:57:50Z","cross_cats_sorted":[],"title_canon_sha256":"e9d8b52aa9e555f817923c11262d2dceba7a1c06d269f481ae2ef168464c9f52","abstract_canon_sha256":"94e72497f8bf2a7fa48b32efe154aa8f6d9c1b8b3b078e251b2fb2962c19b5f0"},"schema_version":"1.0"},"canonical_sha256":"83b42d2749ede7c6f732b12115fe907995fc5666fa6d69b0fa8e1bcc8438a6a8","source":{"kind":"arxiv","id":"1208.3971","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.3971","created_at":"2026-05-18T03:26:08Z"},{"alias_kind":"arxiv_version","alias_value":"1208.3971v2","created_at":"2026-05-18T03:26:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.3971","created_at":"2026-05-18T03:26:08Z"},{"alias_kind":"pith_short_12","alias_value":"QO2C2J2J5XT4","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"QO2C2J2J5XT4N5ZS","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"QO2C2J2J","created_at":"2026-05-18T12:27:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:QO2C2J2J5XT4N5ZSWEQRL7UQPG","target":"record","payload":{"canonical_record":{"source":{"id":"1208.3971","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.CA","submitted_at":"2012-08-20T10:57:50Z","cross_cats_sorted":[],"title_canon_sha256":"e9d8b52aa9e555f817923c11262d2dceba7a1c06d269f481ae2ef168464c9f52","abstract_canon_sha256":"94e72497f8bf2a7fa48b32efe154aa8f6d9c1b8b3b078e251b2fb2962c19b5f0"},"schema_version":"1.0"},"canonical_sha256":"83b42d2749ede7c6f732b12115fe907995fc5666fa6d69b0fa8e1bcc8438a6a8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:26:08.801770Z","signature_b64":"uDi+s/Bw2n2uq90vlBuVINN+FRT72HeKR2VbLprSubSyjK4RG4K/1x/BIaOwDDgJjF8+8ih27OWRMpWV/z4TBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"83b42d2749ede7c6f732b12115fe907995fc5666fa6d69b0fa8e1bcc8438a6a8","last_reissued_at":"2026-05-18T03:26:08.801087Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:26:08.801087Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1208.3971","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":"2026-05-18T03:26:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"caTLHEQtyO3aYy4P/mQrhIl5aWyi8xmKfEB6ZTqoFdZ0fDfpg+HV5jUSX2dEqqAr/opgpxAOk2GQ2ctrn7HEAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T09:25:39.247859Z"},"content_sha256":"d1f88a5b50a0fb4560fca7482b1ab8893b5b80f08f022584e8eb2262505e9834","schema_version":"1.0","event_id":"sha256:d1f88a5b50a0fb4560fca7482b1ab8893b5b80f08f022584e8eb2262505e9834"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:QO2C2J2J5XT4N5ZSWEQRL7UQPG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the differentiability of directionally differentiable functions and applications","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.CA","authors_text":"Hannes Luiro","submitted_at":"2012-08-20T10:57:50Z","abstract_excerpt":"In the first part of this paper we establish, in terms of so called k-tangential sets, a kind of optimal estimate for the size and structure of the set of non-differentiability of Lipshitz functions with one-sided directional derivatives. These results can be applied to many important special functions in analysis, like distance functions or different maximal functions. In the second part, having the results from the first part in our use, we focus more carefully on the differentiability properties of the classical Hardy-Littlewood maximal function. For example, we will show that if f is conti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.3971","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":"2026-05-18T03:26:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aUpfUNI9/w6a9QV+fgdNHRDeQxoOg2tu81aTRs0qp27BuvtG8S79wm2jji95yeYLLoUW9sW/JPwBPL3mooV2Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T09:25:39.248203Z"},"content_sha256":"3567ad053a030c1f5e8c31def365dbbab1b59a2c9e6147787d770a0975fdc8f3","schema_version":"1.0","event_id":"sha256:3567ad053a030c1f5e8c31def365dbbab1b59a2c9e6147787d770a0975fdc8f3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QO2C2J2J5XT4N5ZSWEQRL7UQPG/bundle.json","state_url":"https://pith.science/pith/QO2C2J2J5XT4N5ZSWEQRL7UQPG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QO2C2J2J5XT4N5ZSWEQRL7UQPG/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":"2026-06-29T09:25:39Z","links":{"resolver":"https://pith.science/pith/QO2C2J2J5XT4N5ZSWEQRL7UQPG","bundle":"https://pith.science/pith/QO2C2J2J5XT4N5ZSWEQRL7UQPG/bundle.json","state":"https://pith.science/pith/QO2C2J2J5XT4N5ZSWEQRL7UQPG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QO2C2J2J5XT4N5ZSWEQRL7UQPG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:QO2C2J2J5XT4N5ZSWEQRL7UQPG","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":"94e72497f8bf2a7fa48b32efe154aa8f6d9c1b8b3b078e251b2fb2962c19b5f0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.CA","submitted_at":"2012-08-20T10:57:50Z","title_canon_sha256":"e9d8b52aa9e555f817923c11262d2dceba7a1c06d269f481ae2ef168464c9f52"},"schema_version":"1.0","source":{"id":"1208.3971","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.3971","created_at":"2026-05-18T03:26:08Z"},{"alias_kind":"arxiv_version","alias_value":"1208.3971v2","created_at":"2026-05-18T03:26:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.3971","created_at":"2026-05-18T03:26:08Z"},{"alias_kind":"pith_short_12","alias_value":"QO2C2J2J5XT4","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"QO2C2J2J5XT4N5ZS","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"QO2C2J2J","created_at":"2026-05-18T12:27:18Z"}],"graph_snapshots":[{"event_id":"sha256:3567ad053a030c1f5e8c31def365dbbab1b59a2c9e6147787d770a0975fdc8f3","target":"graph","created_at":"2026-05-18T03:26:08Z","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":"In the first part of this paper we establish, in terms of so called k-tangential sets, a kind of optimal estimate for the size and structure of the set of non-differentiability of Lipshitz functions with one-sided directional derivatives. These results can be applied to many important special functions in analysis, like distance functions or different maximal functions. In the second part, having the results from the first part in our use, we focus more carefully on the differentiability properties of the classical Hardy-Littlewood maximal function. For example, we will show that if f is conti","authors_text":"Hannes Luiro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.CA","submitted_at":"2012-08-20T10:57:50Z","title":"On the differentiability of directionally differentiable functions and applications"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.3971","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:d1f88a5b50a0fb4560fca7482b1ab8893b5b80f08f022584e8eb2262505e9834","target":"record","created_at":"2026-05-18T03:26:08Z","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":"94e72497f8bf2a7fa48b32efe154aa8f6d9c1b8b3b078e251b2fb2962c19b5f0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.CA","submitted_at":"2012-08-20T10:57:50Z","title_canon_sha256":"e9d8b52aa9e555f817923c11262d2dceba7a1c06d269f481ae2ef168464c9f52"},"schema_version":"1.0","source":{"id":"1208.3971","kind":"arxiv","version":2}},"canonical_sha256":"83b42d2749ede7c6f732b12115fe907995fc5666fa6d69b0fa8e1bcc8438a6a8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"83b42d2749ede7c6f732b12115fe907995fc5666fa6d69b0fa8e1bcc8438a6a8","first_computed_at":"2026-05-18T03:26:08.801087Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:26:08.801087Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uDi+s/Bw2n2uq90vlBuVINN+FRT72HeKR2VbLprSubSyjK4RG4K/1x/BIaOwDDgJjF8+8ih27OWRMpWV/z4TBA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:26:08.801770Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.3971","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d1f88a5b50a0fb4560fca7482b1ab8893b5b80f08f022584e8eb2262505e9834","sha256:3567ad053a030c1f5e8c31def365dbbab1b59a2c9e6147787d770a0975fdc8f3"],"state_sha256":"f6281542ff776cf5e16b1475deb9909ade9b436ab63ec294f3515d43a501ec47"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FhGXZpC9+aloYzCA5OVRkAjTmz5a9gNcktQN42jh1onIVXuYLBBVRN9cfuG1R9hr090RQz8FGfN6voxozNlVAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T09:25:39.250085Z","bundle_sha256":"4067dab7fe4f991d36df772991bf881a7704ce0dbf7b5f34f252d276d31b4fe5"}}