Pith Number

pith:DC4T2BMH

pith:2012:DC4T2BMHJBRZNTANBOQDPLDQKO

not attested not anchored not stored refs pending

Optimal regularity at the free boundary for the infinity obstacle problem

Eduardo V. Teixeira, Jos\'e Miguel Urbano, Julio D. Rossi

arxiv:1206.5652 v2 · 2012-06-25 · math.AP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DC4T2BMHJBRZNTANBOQDPLDQKO}

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	2026-05-18T01:31:12.111632Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

18b93d0587486396cc0d0ba037ac705391505b2876339a1c4ddd3ec261aedcda

Aliases

arxiv: 1206.5652 · arxiv_version: 1206.5652v2 · doi: 10.48550/arxiv.1206.5652 · pith_short_12: DC4T2BMHJBRZ · pith_short_16: DC4T2BMHJBRZNTAN · pith_short_8: DC4T2BMH

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/DC4T2BMHJBRZNTANBOQDPLDQKO \
  | 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: 18b93d0587486396cc0d0ba037ac705391505b2876339a1c4ddd3ec261aedcda

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d166306e9de409cf7d607c1972b8b9b1bfb60ccf8d2fdb487d852c03fa771822",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2012-06-25T11:31:40Z",
    "title_canon_sha256": "81c720a637b0a891bd552e02765ad353e7ae02a8f9d07107a5237e95fedcc073"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1206.5652",
    "kind": "arxiv",
    "version": 2
  }
}