Pith Number

pith:PZ4MU2VC

pith:2013:PZ4MU2VCZ6A456EBS7Z7KZJW22

not attested not anchored not stored refs pending

Dictionary Learning and Sparse Coding on Grassmann Manifolds: An Extrinsic Solution

Brian C. Lovell, Chunhua Shen, Conrad Sanderson, Mehrtash Harandi

arxiv:1310.4891 v1 · 2013-10-18 · cs.CV

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PZ4MU2VCZ6A456EBS7Z7KZJW22}

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	2026-05-18T03:10:02.305916Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7e78ca6aa2cf81cef88197f3f56536d6867b3cff495ff33c35fa347b98564ae8

Aliases

arxiv: 1310.4891 · arxiv_version: 1310.4891v1 · doi: 10.48550/arxiv.1310.4891 · pith_short_12: PZ4MU2VCZ6A4 · pith_short_16: PZ4MU2VCZ6A456EB · pith_short_8: PZ4MU2VC

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/PZ4MU2VCZ6A456EBS7Z7KZJW22 \
  | 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: 7e78ca6aa2cf81cef88197f3f56536d6867b3cff495ff33c35fa347b98564ae8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6c382ffdba4f25a186e601a0887e96142abc0f736ad04887a2c0867471964461",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/3.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2013-10-18T03:04:47Z",
    "title_canon_sha256": "253b2a6e81622747647ea49c35aa1c12cb7fcbee57c6ecb3a4a289ee699230f1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1310.4891",
    "kind": "arxiv",
    "version": 1
  }
}