Pith Number

pith:XCVHZJIY

pith:2008:XCVHZJIYL2QZQV4YGOGKMVQPTR

not attested not anchored not stored refs pending

Nonnegative Matrix Factorization via Rank-One Downdate

Ali Ghodsi, Michael Biggs, Stephen Vavasis

arxiv:0805.0120 v1 · 2008-05-01 · cs.IR · cs.NA · 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{XCVHZJIYL2QZQV4YGOGKMVQPTR}

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	2026-06-03T22:06:05.935431Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b8aa7ca5185ea1985798338ca6560f9c65ac00f8421f6f5521c05ced0812ff60

Aliases

arxiv: 0805.0120 · arxiv_version: 0805.0120v1 · doi: 10.48550/arxiv.0805.0120 · pith_short_12: XCVHZJIYL2QZ · pith_short_16: XCVHZJIYL2QZQV4Y · pith_short_8: XCVHZJIY

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/XCVHZJIYL2QZQV4YGOGKMVQPTR \
  | 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: b8aa7ca5185ea1985798338ca6560f9c65ac00f8421f6f5521c05ced0812ff60

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "358a37401f3787fd6e10eb8b4bc3dbc53952c4650571bdbfb2407dd967942062",
    "cross_cats_sorted": [
      "cs.NA",
      "math.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IR",
    "submitted_at": "2008-05-01T17:59:44Z",
    "title_canon_sha256": "27dc58c3d92cca8d26555d83b2a3be89d2f275cd24b30e5b8253da1683ac889d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0805.0120",
    "kind": "arxiv",
    "version": 1
  }
}