Pith Number

pith:BB6UUDGA

pith:2017:BB6UUDGAZL4WPPSHYYBI7L2LDV

not attested not anchored not stored refs pending

Improper Colourings inspired by Hadwiger's Conjecture

David R. Wood, Jan van den Heuvel

arxiv:1704.06536 v4 · 2017-04-21 · 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{BB6UUDGAZL4WPPSHYYBI7L2LDV}

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	2026-05-17T23:40:49.903528Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

087d4a0cc0caf967be47c6028faf4b1d51f9df4f70a7fb67a1e1d3db12b83822

Aliases

arxiv: 1704.06536 · arxiv_version: 1704.06536v4 · doi: 10.48550/arxiv.1704.06536 · pith_short_12: BB6UUDGAZL4W · pith_short_16: BB6UUDGAZL4WPPSH · pith_short_8: BB6UUDGA

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/BB6UUDGAZL4WPPSHYYBI7L2LDV \
  | 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: 087d4a0cc0caf967be47c6028faf4b1d51f9df4f70a7fb67a1e1d3db12b83822

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9c74657cd3bae192bf979a6b91ce175becb2f04a300924d2e8ba4c06b7792249",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2017-04-21T13:37:54Z",
    "title_canon_sha256": "200289d11bd1d9a3d71e382502cb23b7ede3da1927e17694bb07d5dde8977f79"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1704.06536",
    "kind": "arxiv",
    "version": 4
  }
}