Pith Number

pith:6L6MWKUC

pith:2015:6L6MWKUCKOFHUAO5QQAG3256QY

not attested not anchored not stored refs pending

Riemannian Dictionary Learning and Sparse Coding for Positive Definite Matrices

Anoop Cherian, Suvrit Sra

arxiv:1507.02772 v2 · 2015-07-10 · 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{6L6MWKUCKOFHUAO5QQAG3256QY}

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	2026-05-18T01:24:10.710475Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f2fccb2a82538a7a01dd84006debbe861e2d3507a206ed84b631909864398799

Aliases

arxiv: 1507.02772 · arxiv_version: 1507.02772v2 · doi: 10.48550/arxiv.1507.02772 · pith_short_12: 6L6MWKUCKOFH · pith_short_16: 6L6MWKUCKOFHUAO5 · pith_short_8: 6L6MWKUC

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/6L6MWKUCKOFHUAO5QQAG3256QY \
  | 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: f2fccb2a82538a7a01dd84006debbe861e2d3507a206ed84b631909864398799

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "705b29026aa316a292c1ce8e86464ba4bd7ddd921ff1ab89739f5a99090aded6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2015-07-10T03:18:50Z",
    "title_canon_sha256": "058882cf124595ba82313616c8b217fdb16c8f1f50da197af702deea664ce085"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1507.02772",
    "kind": "arxiv",
    "version": 2
  }
}