Pith Number

pith:4AI5I7DL

pith:2013:4AI5I7DLJSJX3LPNEPZ63FXXG4

not attested not anchored not stored refs pending

Sparse Coding and Dictionary Learning for Symmetric Positive Definite Matrices: A Kernel Approach

Brian C. Lovell, Conrad Sanderson, Mehrtash T. Harandi, Richard Hartley

arxiv:1304.4344 v1 · 2013-04-16 · cs.LG · cs.CV · stat.ML

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4AI5I7DLJSJX3LPNEPZ63FXXG4}

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	2026-05-18T03:27:53.369998Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e011d47c6b4c937daded23f3ed96f7373d2f5379b569ad6c72b99057d33ef194

Aliases

arxiv: 1304.4344 · arxiv_version: 1304.4344v1 · doi: 10.48550/arxiv.1304.4344 · pith_short_12: 4AI5I7DLJSJX · pith_short_16: 4AI5I7DLJSJX3LPN · pith_short_8: 4AI5I7DL

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/4AI5I7DLJSJX3LPNEPZ63FXXG4 \
  | 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: e011d47c6b4c937daded23f3ed96f7373d2f5379b569ad6c72b99057d33ef194

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7bcb82b15f66454d44833a1267fa8df087e6b3ea13ef1e92b9bc086de80adeba",
    "cross_cats_sorted": [
      "cs.CV",
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2013-04-16T06:47:03Z",
    "title_canon_sha256": "8950ff30958a4f3bf668d9f664a59aef8de0dd5ae950c76cf5c693a314c381da"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.4344",
    "kind": "arxiv",
    "version": 1
  }
}