Pith Number

pith:Y4T2ETOT

pith:2009:Y4T2ETOT55QU63KZVND3GAEGQA

not attested not anchored not stored refs pending

A Variable Splitting Augmented Lagrangian Approach to Linear Spectral Unmixing

Jose Bioucas-Dias

arxiv:0904.4635 v1 · 2009-04-29 · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Y4T2ETOT55QU63KZVND3GAEGQA}

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	2026-05-18T00:58:20.205398Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c727a24dd3ef614f6d59ab47b30086802818328645cd2d9f0c6f41b6a2079394

Aliases

arxiv: 0904.4635 · arxiv_version: 0904.4635v1 · doi: 10.48550/arxiv.0904.4635 · pith_short_12: Y4T2ETOT55QU · pith_short_16: Y4T2ETOT55QU63KZ · pith_short_8: Y4T2ETOT

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/Y4T2ETOT55QU63KZVND3GAEGQA \
  | 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: c727a24dd3ef614f6d59ab47b30086802818328645cd2d9f0c6f41b6a2079394

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0ecf481b47cf6252b0e0fa219c2f72530b0d0c38a83c79c70b6ae3ea1144c075",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2009-04-29T15:31:41Z",
    "title_canon_sha256": "301ce2aff67a268ac6deffb6ac2636018d230fd842bfc809333897f23039de79"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.4635",
    "kind": "arxiv",
    "version": 1
  }
}