Pith Number

pith:ZZSTFI7K

pith:2019:ZZSTFI7KDOYQ7IJBW554YUEYDI

not attested not anchored not stored refs pending

Finding magic squares with the Douglas-Rachford algorithm

Francisco J. Arag\'on Artacho, Paula Segura Mart\'inez

arxiv:1902.08478 v1 · 2019-02-22 · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZZSTFI7KDOYQ7IJBW554YUEYDI}

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	2026-05-17T23:52:57.116306Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ce6532a3ea1bb10fa121b77bcc50981a0820d79232bbb2d12789c60004f83f3f

Aliases

arxiv: 1902.08478 · arxiv_version: 1902.08478v1 · doi: 10.48550/arxiv.1902.08478 · pith_short_12: ZZSTFI7KDOYQ · pith_short_16: ZZSTFI7KDOYQ7IJB · pith_short_8: ZZSTFI7K

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/ZZSTFI7KDOYQ7IJBW554YUEYDI \
  | 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: ce6532a3ea1bb10fa121b77bcc50981a0820d79232bbb2d12789c60004f83f3f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ce9902c8d495dff98ad3cd2c8d1ffd6646bf530311dced4e21512f7c2aa85244",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2019-02-22T13:00:53Z",
    "title_canon_sha256": "4d96710df38da2b24f2b3299e1a827892befa74d3285cd93a2ff1c79da75f084"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.08478",
    "kind": "arxiv",
    "version": 1
  }
}