Pith Number

pith:4I54NSJT

pith:2013:4I54NSJTAY5N4D7BVI7EQSWX4X

not attested not anchored not stored refs pending

Optimal Regularity and the Free Boundary in the Parabolic Signorini Problem

Arshak Petrosyan, Donatella Danielli, Nicola Garofalo, Tung To

arxiv:1306.5213 v2 · 2013-06-21 · 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{4I54NSJTAY5N4D7BVI7EQSWX4X}

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	2026-05-18T03:19:58.669874Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e23bc6c933063ade0fe1aa3e484ad7e5c93e34836a4e7ef5f4aa22fcdc1ae2e9

Aliases

arxiv: 1306.5213 · arxiv_version: 1306.5213v2 · doi: 10.48550/arxiv.1306.5213 · pith_short_12: 4I54NSJTAY5N · pith_short_16: 4I54NSJTAY5N4D7B · pith_short_8: 4I54NSJT

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/4I54NSJTAY5N4D7BVI7EQSWX4X \
  | 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: e23bc6c933063ade0fe1aa3e484ad7e5c93e34836a4e7ef5f4aa22fcdc1ae2e9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "831d3d1b87d7fed1f8b06a5eae0358da66285e2ab7144f1efad9810bf32c2a0a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2013-06-21T18:53:26Z",
    "title_canon_sha256": "f748fcc4f5510672028efbd10b269520f2f638d408d1853d4b8c2e780c7fbe3c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1306.5213",
    "kind": "arxiv",
    "version": 2
  }
}