Pith Number

pith:JRNQ2FZH

pith:2012:JRNQ2FZHFKBE5BFY55SI7PPR3R

not attested not anchored not stored refs pending

The black-and-white coloring problem on permutation graphs

Ton Kloks

arxiv:1201.6421 v1 · 2012-01-31 · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{JRNQ2FZHFKBE5BFY55SI7PPR3R}

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	2026-05-18T04:03:31.557771Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4c5b0d17272a824e84b8ef648fbdf1dc5c499c01c934cb19aeb9c5070db7f7c6

Aliases

arxiv: 1201.6421 · arxiv_version: 1201.6421v1 · doi: 10.48550/arxiv.1201.6421 · pith_short_12: JRNQ2FZHFKBE · pith_short_16: JRNQ2FZHFKBE5BFY · pith_short_8: JRNQ2FZH

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/JRNQ2FZHFKBE5BFY55SI7PPR3R \
  | 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: 4c5b0d17272a824e84b8ef648fbdf1dc5c499c01c934cb19aeb9c5070db7f7c6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1bc8b1b8e1431cd40b855dc229c574475380e88306785c093a52691ff8384768",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2012-01-31T02:40:54Z",
    "title_canon_sha256": "89a157219827587d842e14ec5f5c8ddc55bcfce463e82378d74eed19e7e3d79a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1201.6421",
    "kind": "arxiv",
    "version": 1
  }
}