Pith Number

pith:EDF4OWOR

pith:2011:EDF4OWORZKJAEV675LFRZFIP4S

not attested not anchored not stored refs pending

Representative sets and irrelevant vertices: New tools for kernelization

Magnus Wahlstr\"om, Stefan Kratsch

arxiv:1111.2195 v2 · 2011-11-09 · cs.DS

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

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	2026-05-18T02:21:34.828590Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

20cbc759d1ca920257dfeacb1c950fe4ac5ffd4cb00998fde3a9c58d3bbe5d17

Aliases

arxiv: 1111.2195 · arxiv_version: 1111.2195v2 · doi: 10.48550/arxiv.1111.2195 · pith_short_12: EDF4OWORZKJA · pith_short_16: EDF4OWORZKJAEV67 · pith_short_8: EDF4OWOR

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/EDF4OWORZKJAEV675LFRZFIP4S \
  | 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: 20cbc759d1ca920257dfeacb1c950fe4ac5ffd4cb00998fde3a9c58d3bbe5d17

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dc524a47de07bbad6299b90e44ae5dd9e303d2761f35b8ccde91cfd3107cf184",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2011-11-09T12:55:42Z",
    "title_canon_sha256": "fef00b3deb1180dcfbc4860331e9ef41cf9ec591c4d6a24d2d42ec9b6fc76e57"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1111.2195",
    "kind": "arxiv",
    "version": 2
  }
}