Pith Number

pith:BSY2VT4O

pith:2012:BSY2VT4O6S7TB7EABWLMSN7X4S

not attested not anchored not stored refs pending

Forbidden Configurations: Finding the number predicted by the Anstee-Sali Conjecture is NP-hard

Miguel Raggi

arxiv:1210.8189 v2 · 2012-10-30 · 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{BSY2VT4O6S7TB7EABWLMSN7X4S}

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	2026-05-18T03:35:13.550478Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0cb1aacf8ef4bf30fc800d96c937f7e49bedbb3c50ff882d489743b8dfbd455e

Aliases

arxiv: 1210.8189 · arxiv_version: 1210.8189v2 · doi: 10.48550/arxiv.1210.8189 · pith_short_12: BSY2VT4O6S7T · pith_short_16: BSY2VT4O6S7TB7EA · pith_short_8: BSY2VT4O

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/BSY2VT4O6S7TB7EABWLMSN7X4S \
  | 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: 0cb1aacf8ef4bf30fc800d96c937f7e49bedbb3c50ff882d489743b8dfbd455e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "697055a8b98165a3460530af138b7a7ba2bc20b79dba820ada4a92e2dec86620",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2012-10-30T22:21:49Z",
    "title_canon_sha256": "a68de18a73c090316c9cbbae8b4921d62b54b7bf2a08f5f0043b09589d24c4e3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1210.8189",
    "kind": "arxiv",
    "version": 2
  }
}