Pith Number

pith:6HBRZ2KS

pith:2013:6HBRZ2KSS6Y2YKGSCF4NJQ4WCJ

not attested not anchored not stored refs pending

Projection onto the Cosparse Set is NP-Hard

Andreas M. Tillmann, Marc E. Pfetsch, R\'emi Gribonval (INRIA - IRISA)

arxiv:1303.5305 v2 · 2013-03-21 · cs.CC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{6HBRZ2KSS6Y2YKGSCF4NJQ4WCJ}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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	2026-05-18T02:56:44.291898Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f1c31ce95297b1ac28d21178d4c39612670a91f40c268c749f592218270b0a2b

Aliases

arxiv: 1303.5305 · arxiv_version: 1303.5305v2 · doi: 10.48550/arxiv.1303.5305 · pith_short_12: 6HBRZ2KSS6Y2 · pith_short_16: 6HBRZ2KSS6Y2YKGS · pith_short_8: 6HBRZ2KS

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/6HBRZ2KSS6Y2YKGSCF4NJQ4WCJ \
  | 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: f1c31ce95297b1ac28d21178d4c39612670a91f40c268c749f592218270b0a2b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bf36d19e9a274acf33f31f73ce74530c746d20acd6b53609761e871e6efcece2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2013-03-21T15:42:18Z",
    "title_canon_sha256": "5327b51a8016fdf4d9a4a029d009c0cc697d9ab0a7be0ca99d83d6e80992c238"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1303.5305",
    "kind": "arxiv",
    "version": 2
  }
}