Pith Number

pith:654NK3GO

pith:2018:654NK3GOYZTAG5K66R3JYEWLCS

not attested not anchored not stored refs pending

First-Order Least-Squares Method for the Obstacle Problem

Thomas F\"uhrer

arxiv:1801.09622 v1 · 2018-01-29 · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{654NK3GOYZTAG5K66R3JYEWLCS}

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	2026-05-18T00:24:56.890691Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f778d56ccec66603755ef4769c12cb14ad35d1b64892ccf93561e5538a9e8e29

Aliases

arxiv: 1801.09622 · arxiv_version: 1801.09622v1 · doi: 10.48550/arxiv.1801.09622 · pith_short_12: 654NK3GOYZTA · pith_short_16: 654NK3GOYZTAG5K6 · pith_short_8: 654NK3GO

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/654NK3GOYZTAG5K66R3JYEWLCS \
  | 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: f778d56ccec66603755ef4769c12cb14ad35d1b64892ccf93561e5538a9e8e29

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "db4c6dd5f319262c1805e1292d78effdde3030e244202b3b6a47b16cc09962b9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-01-29T16:54:00Z",
    "title_canon_sha256": "52ca21b9329e21741ee686e0346576163ccfcc19da6b8b8f88000718d58ac20a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.09622",
    "kind": "arxiv",
    "version": 1
  }
}