Pith Number

pith:RQ63PTRV

pith:2010:RQ63PTRVAF2EUQ4CSCGXQX5ICJ

not attested not anchored not stored refs pending

Rectangle Free Coloring of Grids

Charles Glover, Semmy Purewal, Stephen Fenner, William Gasarch

arxiv:1005.3750 v2 · 2010-05-20 · 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{RQ63PTRVAF2EUQ4CSCGXQX5ICJ}

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	2026-05-18T03:41:01.630673Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8c3db7ce3501744a4382908d785fa812514c54a82cba76092f858d72f5de1641

Aliases

arxiv: 1005.3750 · arxiv_version: 1005.3750v2 · doi: 10.48550/arxiv.1005.3750 · pith_short_12: RQ63PTRVAF2E · pith_short_16: RQ63PTRVAF2EUQ4C · pith_short_8: RQ63PTRV

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/RQ63PTRVAF2EUQ4CSCGXQX5ICJ \
  | 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: 8c3db7ce3501744a4382908d785fa812514c54a82cba76092f858d72f5de1641

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e8c1c681bb8a87df63632f520f8fd3c29251e5f7b1744b94c123d42cb0caf436",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2010-05-20T16:12:40Z",
    "title_canon_sha256": "a106cc2fbd9c5846f8eb548c043a42a18865f31d7ee48694b6f403db8badea5f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1005.3750",
    "kind": "arxiv",
    "version": 2
  }
}