Pith Number

pith:5FLXDOD4

pith:2005:5FLXDOD4X6GLJGJLQMVQH5LGSC

not attested not anchored not stored refs pending

Finding Almost Squares

Tsz Ho Chan

arxiv:math/0502199 v2 · 2005-02-09 · math.NT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5FLXDOD4X6GLJGJLQMVQH5LGSC}

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	2026-05-18T01:38:26.940950Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e95771b87cbf8cb4992b832b03f56690a2c5f0d29f4fae2e4f6e3265bbbfbfce

Aliases

arxiv: math/0502199 · arxiv_version: math/0502199v2 · doi: 10.48550/arxiv.math/0502199 · pith_short_12: 5FLXDOD4X6GL · pith_short_16: 5FLXDOD4X6GLJGJL · pith_short_8: 5FLXDOD4

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/5FLXDOD4X6GLJGJLQMVQH5LGSC \
  | 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: e95771b87cbf8cb4992b832b03f56690a2c5f0d29f4fae2e4f6e3265bbbfbfce

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e5649a271eb41be9267a545324744e581450c8999c305b0e854dbdcf1f36c1eb",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.NT",
    "submitted_at": "2005-02-09T18:11:50Z",
    "title_canon_sha256": "b563304578c93da6d37cd111fe554ad8127c2847283ae75676aab6256d5475b6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0502199",
    "kind": "arxiv",
    "version": 2
  }
}