Pith Number

pith:HMAFCNT3

pith:2009:HMAFCNT3FHNOTYXOTKGFWITLXN

not attested not anchored not stored refs pending

The hardness of the independence and matching clutter of a graph

Hovhannes Sargsyan, Sasun Hambardzumyan, Vahan V. Mkrtchyan, Vahe L. Musoyan

arxiv:0903.4907 v4 · 2009-03-28 · cs.DM · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HMAFCNT3FHNOTYXOTKGFWITLXN}

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	2026-05-18T01:24:44.185046Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3b0051367b29dae9e2ee9a8c5b226bbb5beb497caa1d84401afb295ec3acb221

Aliases

arxiv: 0903.4907 · arxiv_version: 0903.4907v4 · doi: 10.48550/arxiv.0903.4907 · pith_short_12: HMAFCNT3FHNO · pith_short_16: HMAFCNT3FHNOTYXO · pith_short_8: HMAFCNT3

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/HMAFCNT3FHNOTYXOTKGFWITLXN \
  | 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: 3b0051367b29dae9e2ee9a8c5b226bbb5beb497caa1d84401afb295ec3acb221

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f36025ca7f4f33903a4f160d45fcbef9f16916b2bcc6487301a0aae5334b27b8",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2009-03-28T02:15:17Z",
    "title_canon_sha256": "a9eb780d98e30ef1047cd452944c7d96c25c8c8b189caadb2173ffc2106c94a8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.4907",
    "kind": "arxiv",
    "version": 4
  }
}