Pith Number

pith:DD4XBUVK

pith:2012:DD4XBUVKRE7CR7EPCLCSI5CQFV

not attested not anchored not stored refs pending

The Hardness of the Functional Orientation 2-Color Problem

Hjalte Wedel Vildh{\o}j, Morten St\"ockel, S{\o}ren B{\o}g

arxiv:1210.2544 v2 · 2012-10-09 · cs.CC · 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{DD4XBUVKRE7CR7EPCLCSI5CQFV}

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	2026-05-18T03:27:22.935787Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

18f970d2aa893e28fc8f12c52474502d4afd9f40fb6a69a8a7e05e4debd2e5de

Aliases

arxiv: 1210.2544 · arxiv_version: 1210.2544v2 · doi: 10.48550/arxiv.1210.2544 · pith_short_12: DD4XBUVKRE7C · pith_short_16: DD4XBUVKRE7CR7EP · pith_short_8: DD4XBUVK

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/DD4XBUVKRE7CR7EPCLCSI5CQFV \
  | 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: 18f970d2aa893e28fc8f12c52474502d4afd9f40fb6a69a8a7e05e4debd2e5de

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c1a197801170dac61006ccde2aa4a5e980c81214ff2e8f160ab2573049c2e595",
    "cross_cats_sorted": [
      "cs.DM",
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2012-10-09T09:59:22Z",
    "title_canon_sha256": "bc11c5892d35c738bc665383361129c571acd9fd9f73a25f7e7e53a47cf73710"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1210.2544",
    "kind": "arxiv",
    "version": 2
  }
}