Pith Number

pith:PHFJNQSB

pith:2012:PHFJNQSBOYR4M2POPA3MWKVMHX

not attested not anchored not stored refs pending

Extracting Energy from an External Magnetic Field

Edmundo Capelas de Oliveira, Waldyr A. Rodrigues Jr.

arxiv:1208.1702 v2 · 2012-08-08 · math-ph · gr-qc · math.MP

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PHFJNQSBOYR4M2POPA3MWKVMHX}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T03:45:12.126369Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

79ca96c2417623c669ee7836cb2aac3df030fa811facff20842391058f7def78

Aliases

arxiv: 1208.1702 · arxiv_version: 1208.1702v2 · doi: 10.48550/arxiv.1208.1702 · pith_short_12: PHFJNQSBOYR4 · pith_short_16: PHFJNQSBOYR4M2PO · pith_short_8: PHFJNQSB

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/PHFJNQSBOYR4M2POPA3MWKVMHX \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 79ca96c2417623c669ee7836cb2aac3df030fa811facff20842391058f7def78

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d70b52e3c138f743abdb300c0e80f92058955421d493c1a61f5de36a37d2dfad",
    "cross_cats_sorted": [
      "gr-qc",
      "math.MP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math-ph",
    "submitted_at": "2012-08-08T16:27:01Z",
    "title_canon_sha256": "c3bb89797dd20bbca4cf0d36392d098e5407de17f308bdbf2e10c312e803a482"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1208.1702",
    "kind": "arxiv",
    "version": 2
  }
}