{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:HQP7SKA5JK24JDDYECYSKQIHWN","short_pith_number":"pith:HQP7SKA5","canonical_record":{"source":{"id":"0903.4497","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2009-03-26T15:10:31Z","cross_cats_sorted":["physics.ed-ph"],"title_canon_sha256":"eec468cda55d8bc124acb8dc5a155f72a9f9947f3c889592fc4c44e901e1dce7","abstract_canon_sha256":"0740d0c43c9a46b73961610d150f402a03a5ba508db43bf589c9c407ab9e78e7"},"schema_version":"1.0"},"canonical_sha256":"3c1ff9281d4ab5c48c7820b1254107b35c6ee59ce59d579a708c03b9175983ac","source":{"kind":"arxiv","id":"0903.4497","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.4497","created_at":"2026-05-18T03:46:32Z"},{"alias_kind":"arxiv_version","alias_value":"0903.4497v3","created_at":"2026-05-18T03:46:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.4497","created_at":"2026-05-18T03:46:32Z"},{"alias_kind":"pith_short_12","alias_value":"HQP7SKA5JK24","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HQP7SKA5JK24JDDY","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HQP7SKA5","created_at":"2026-05-18T12:25:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:HQP7SKA5JK24JDDYECYSKQIHWN","target":"record","payload":{"canonical_record":{"source":{"id":"0903.4497","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2009-03-26T15:10:31Z","cross_cats_sorted":["physics.ed-ph"],"title_canon_sha256":"eec468cda55d8bc124acb8dc5a155f72a9f9947f3c889592fc4c44e901e1dce7","abstract_canon_sha256":"0740d0c43c9a46b73961610d150f402a03a5ba508db43bf589c9c407ab9e78e7"},"schema_version":"1.0"},"canonical_sha256":"3c1ff9281d4ab5c48c7820b1254107b35c6ee59ce59d579a708c03b9175983ac","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:46:32.189414Z","signature_b64":"G8RnkQTAgZ6KgfN15cG2OC+bki1Ep46Y5WcSOwDnfBltTs7mSzIxX1FC5uZdMp2tJrBR/OA2G0nomUkeEHl7Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3c1ff9281d4ab5c48c7820b1254107b35c6ee59ce59d579a708c03b9175983ac","last_reissued_at":"2026-05-18T03:46:32.188678Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:46:32.188678Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0903.4497","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:46:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zDFH7CwV9GGOGhAy0LQnQ8W8GMoMkyGItvm7euE1P5tclQfCK6xQGAp350v/A43Iy79zplJX4qNRl2B0PeAWDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T09:06:10.287604Z"},"content_sha256":"2e3c1114ecdd17582b3044ed436692bff433d8f4e7a4c546aa29c3c4bd610eab","schema_version":"1.0","event_id":"sha256:2e3c1114ecdd17582b3044ed436692bff433d8f4e7a4c546aa29c3c4bd610eab"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:HQP7SKA5JK24JDDYECYSKQIHWN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Subtleties on energy calculations in the image method","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ed-ph"],"primary_cat":"physics.class-ph","authors_text":"C. Farina, M. M. Taddei, T. N. C. Mendes","submitted_at":"2009-03-26T15:10:31Z","abstract_excerpt":"In this pedagogical work we point out a subtle mistake that can be done by undergraduate or graduate students in the computation of the electrostatic energy of a system containing charges and perfect conductors if they naively use the image method. Specifically, we show that the naive expressions for the electrostatic energy for these systems obtained directly from the image method are wrong by a factor 1/2. We start our discussion with well known examples, namely, point charge-perfectly conducting wall and point charge-perfectly conducting sphere and then proceed to the demonstration of gener"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.4497","kind":"arxiv","version":3},"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":"2026-05-18T03:46:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9y3TV1C/6+I0dl5GAwkpGMiQVU9mrlevie0VjxN31Pmsz/mCKdZJ+trIQN/IPZ7dm9Cubbuvaf1NcillX6lAAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T09:06:10.288231Z"},"content_sha256":"7f35c8c87eaa461d05ea279b20afdcd296c0da0013fd50358eafeb68a52f35fd","schema_version":"1.0","event_id":"sha256:7f35c8c87eaa461d05ea279b20afdcd296c0da0013fd50358eafeb68a52f35fd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HQP7SKA5JK24JDDYECYSKQIHWN/bundle.json","state_url":"https://pith.science/pith/HQP7SKA5JK24JDDYECYSKQIHWN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HQP7SKA5JK24JDDYECYSKQIHWN/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":"2026-06-09T09:06:10Z","links":{"resolver":"https://pith.science/pith/HQP7SKA5JK24JDDYECYSKQIHWN","bundle":"https://pith.science/pith/HQP7SKA5JK24JDDYECYSKQIHWN/bundle.json","state":"https://pith.science/pith/HQP7SKA5JK24JDDYECYSKQIHWN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HQP7SKA5JK24JDDYECYSKQIHWN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:HQP7SKA5JK24JDDYECYSKQIHWN","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":"0740d0c43c9a46b73961610d150f402a03a5ba508db43bf589c9c407ab9e78e7","cross_cats_sorted":["physics.ed-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2009-03-26T15:10:31Z","title_canon_sha256":"eec468cda55d8bc124acb8dc5a155f72a9f9947f3c889592fc4c44e901e1dce7"},"schema_version":"1.0","source":{"id":"0903.4497","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.4497","created_at":"2026-05-18T03:46:32Z"},{"alias_kind":"arxiv_version","alias_value":"0903.4497v3","created_at":"2026-05-18T03:46:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.4497","created_at":"2026-05-18T03:46:32Z"},{"alias_kind":"pith_short_12","alias_value":"HQP7SKA5JK24","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HQP7SKA5JK24JDDY","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HQP7SKA5","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:7f35c8c87eaa461d05ea279b20afdcd296c0da0013fd50358eafeb68a52f35fd","target":"graph","created_at":"2026-05-18T03:46:32Z","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 this pedagogical work we point out a subtle mistake that can be done by undergraduate or graduate students in the computation of the electrostatic energy of a system containing charges and perfect conductors if they naively use the image method. Specifically, we show that the naive expressions for the electrostatic energy for these systems obtained directly from the image method are wrong by a factor 1/2. We start our discussion with well known examples, namely, point charge-perfectly conducting wall and point charge-perfectly conducting sphere and then proceed to the demonstration of gener","authors_text":"C. Farina, M. M. Taddei, T. N. C. Mendes","cross_cats":["physics.ed-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2009-03-26T15:10:31Z","title":"Subtleties on energy calculations in the image method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.4497","kind":"arxiv","version":3},"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":"sha256:2e3c1114ecdd17582b3044ed436692bff433d8f4e7a4c546aa29c3c4bd610eab","target":"record","created_at":"2026-05-18T03:46:32Z","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":"0740d0c43c9a46b73961610d150f402a03a5ba508db43bf589c9c407ab9e78e7","cross_cats_sorted":["physics.ed-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2009-03-26T15:10:31Z","title_canon_sha256":"eec468cda55d8bc124acb8dc5a155f72a9f9947f3c889592fc4c44e901e1dce7"},"schema_version":"1.0","source":{"id":"0903.4497","kind":"arxiv","version":3}},"canonical_sha256":"3c1ff9281d4ab5c48c7820b1254107b35c6ee59ce59d579a708c03b9175983ac","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3c1ff9281d4ab5c48c7820b1254107b35c6ee59ce59d579a708c03b9175983ac","first_computed_at":"2026-05-18T03:46:32.188678Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:46:32.188678Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"G8RnkQTAgZ6KgfN15cG2OC+bki1Ep46Y5WcSOwDnfBltTs7mSzIxX1FC5uZdMp2tJrBR/OA2G0nomUkeEHl7Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:46:32.189414Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.4497","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2e3c1114ecdd17582b3044ed436692bff433d8f4e7a4c546aa29c3c4bd610eab","sha256:7f35c8c87eaa461d05ea279b20afdcd296c0da0013fd50358eafeb68a52f35fd"],"state_sha256":"d8349f416a53adf81a67079aa8a781a4d613718625b126d53c32475b808796af"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bieXU4NWapHqEBwq5kEImXH7l2CdSdUllUcT2WMK75dpY/+iF2sDPIjF8o6trmXnmvTdsr2z4atximR++kzdDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T09:06:10.292329Z","bundle_sha256":"73cb437fe5ab45980d6dce73a9662021aaf977279f45f7870bdcaec9f9cecaf7"}}