Pith Number

pith:S2BPBK6D

pith:2009:S2BPBK6DTZYKH5SS2GMQZZQH7O

not attested not anchored not stored refs pending

Uniform Regularity close to Cross Singularities in an Unstable Free Boundary Problem

Georg S. Weiss, Henrik Shahgholian, John Andersson

arxiv:0905.2811 v1 · 2009-05-18 · 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{S2BPBK6DTZYKH5SS2GMQZZQH7O}

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	2026-05-18T02:13:38.975150Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9682f0abc39e70a3f652d1990ce607fb888885c407623566d9b0e6d245e80ff2

Aliases

arxiv: 0905.2811 · arxiv_version: 0905.2811v1 · doi: 10.48550/arxiv.0905.2811 · pith_short_12: S2BPBK6DTZYK · pith_short_16: S2BPBK6DTZYKH5SS · pith_short_8: S2BPBK6D

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/S2BPBK6DTZYKH5SS2GMQZZQH7O \
  | 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: 9682f0abc39e70a3f652d1990ce607fb888885c407623566d9b0e6d245e80ff2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4e0d8ab57c2fb9edc9b45fdf8d5719a27dac5db6218dd75b26a9532064b7c9e1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2009-05-18T06:17:36Z",
    "title_canon_sha256": "b7f354ad100a46484a0ed388376b1666ba91b9ea6020c3ae61a28354b0201b76"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.2811",
    "kind": "arxiv",
    "version": 1
  }
}