Pith Number

pith:POWCPO7T

pith:2012:POWCPO7TQASNBPZMYKI2KGXGEJ

not attested not anchored not stored refs pending

On two relaxations of quadratically-constrained cardinality minimization

Dennis Wei

arxiv:1210.5225 v1 · 2012-10-18 · math.OC

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

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	2026-05-18T03:42:53.579510Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7bac27bbf38024d0bf2cc291a51ae622735e6060c572a23a3f274905e266e229

Aliases

arxiv: 1210.5225 · arxiv_version: 1210.5225v1 · doi: 10.48550/arxiv.1210.5225 · pith_short_12: POWCPO7TQASN · pith_short_16: POWCPO7TQASNBPZM · pith_short_8: POWCPO7T

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/POWCPO7TQASNBPZMYKI2KGXGEJ \
  | 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: 7bac27bbf38024d0bf2cc291a51ae622735e6060c572a23a3f274905e266e229

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2b4353b0a182263e36ba6533b054847f737559ac37bfb478555853d3ebe661d9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2012-10-18T19:15:52Z",
    "title_canon_sha256": "d2df86ec894ab0eb94dc1373eecb6d54b52c77413db8bdeab5614257d1ee04bc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1210.5225",
    "kind": "arxiv",
    "version": 1
  }
}