Pith Number

pith:4WZUGERN

pith:2017:4WZUGERN67P6F2WZY4MLZZ6JDJ

not attested not anchored not stored refs pending

Quantitative stability of the free boundary in the obstacle problem

Joaquim Serra, Sylvia Serfaty

arxiv:1708.01490 v1 · 2017-08-04 · math.AP · math-ph · math.CV · 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{4WZUGERN67P6F2WZY4MLZZ6JDJ}

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	2026-05-18T00:14:11.358657Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e5b343122df7dfe2ead9c718bce7c91a423fec047f05b810040c235738d96ad1

Aliases

arxiv: 1708.01490 · arxiv_version: 1708.01490v1 · doi: 10.48550/arxiv.1708.01490 · pith_short_12: 4WZUGERN67P6 · pith_short_16: 4WZUGERN67P6F2WZ · pith_short_8: 4WZUGERN

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/4WZUGERN67P6F2WZY4MLZZ6JDJ \
  | 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: e5b343122df7dfe2ead9c718bce7c91a423fec047f05b810040c235738d96ad1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6e76ca521462efb1df738ad9e517d489a78fda3c2dd9f36a67e8750b451cf830",
    "cross_cats_sorted": [
      "math-ph",
      "math.CV",
      "math.MP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2017-08-04T13:31:53Z",
    "title_canon_sha256": "74b29666a55749da8fa03cd7593dcaa05ebf4e5244a6d2235ae5d7ea2b0f49fd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1708.01490",
    "kind": "arxiv",
    "version": 1
  }
}