Pith Number

pith:5R7DKVV5

pith:2009:5R7DKVV56Q7RVEZ5ERMLB3IP4B

not attested not anchored not stored refs pending

Greedy Solution of Ill-Posed Problems: Error Bounds and Exact Inversion

Dennis Trede, Dirk A. Lorenz, Loic Denis

arxiv:0904.0154 v3 · 2009-04-01 · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5R7DKVV56Q7RVEZ5ERMLB3IP4B}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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	2026-05-18T04:38:50.921524Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ec7e3556bdf43f1a933d2458b0ed0fe05ad195a55ab63fea07c5cba910aa2999

Aliases

arxiv: 0904.0154 · arxiv_version: 0904.0154v3 · doi: 10.48550/arxiv.0904.0154 · pith_short_12: 5R7DKVV56Q7R · pith_short_16: 5R7DKVV56Q7RVEZ5 · pith_short_8: 5R7DKVV5

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/5R7DKVV56Q7RVEZ5ERMLB3IP4B \
  | 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: ec7e3556bdf43f1a933d2458b0ed0fe05ad195a55ab63fea07c5cba910aa2999

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d4f496c028afbc7a14b6530f42d7ea0fd102a83056a7d8ea0c6adf4e8aa3e8ba",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2009-04-01T13:23:16Z",
    "title_canon_sha256": "5313e70c5ecde69f6e732eacf32ec91ad530cb6d87a39d7e2950df062deeab15"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.0154",
    "kind": "arxiv",
    "version": 3
  }
}