Pith Number

pith:ULGA52P6

pith:2016:ULGA52P6JTIKZWY44GZSGDSFSV

not attested not anchored not stored refs pending

The oldest example of $\pi=3+1/8$ in Sumer: Calculation of the area of a circular plot

Kazuo Muroi

arxiv:1610.03380 v1 · 2016-10-10 · math.HO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ULGA52P6JTIKZWY44GZSGDSFSV}

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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.

Cited by

1 paper in Pith

AnOldBabylonian coefficient, its origin and impact on our understanding of measures on circles, including the radian measure

Receipt and verification

First computed	2026-05-18T01:02:31.649213Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a2cc0ee9fe4cd0acdb1ce1b3230e459563edcb21840458dceca709eeaf7fa60c

Aliases

arxiv: 1610.03380 · arxiv_version: 1610.03380v1 · doi: 10.48550/arxiv.1610.03380 · pith_short_12: ULGA52P6JTIK · pith_short_16: ULGA52P6JTIKZWY4 · pith_short_8: ULGA52P6

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/ULGA52P6JTIKZWY44GZSGDSFSV \
  | 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: a2cc0ee9fe4cd0acdb1ce1b3230e459563edcb21840458dceca709eeaf7fa60c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dc1c7a031cf58f77b2b637c9b64d7c1394b0d5d66ba074b9522a16040ffc0c22",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2016-10-10T00:46:16Z",
    "title_canon_sha256": "f4c9354fa32bc4725e3c0f310939fba9aea47688db4f22681ef423338331fc9d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1610.03380",
    "kind": "arxiv",
    "version": 1
  }
}