Pith Number

pith:SWJPK2UZ

pith:2019:SWJPK2UZGTC5ERXYS3NTYFQA45

not attested not anchored not stored refs pending

Brahmagupta quadrilaterals with equal perimeters and equal areas

Ajai Choudhry

arxiv:1901.05785 v1 · 2019-01-17 · 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{SWJPK2UZGTC5ERXYS3NTYFQA45}

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	2026-05-17T23:56:06.166055Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9592f56a9934c5d246f896db3c1600e74b23ec0bba36271d675c071543e4194b

Aliases

arxiv: 1901.05785 · arxiv_version: 1901.05785v1 · doi: 10.48550/arxiv.1901.05785 · pith_short_12: SWJPK2UZGTC5 · pith_short_16: SWJPK2UZGTC5ERXY · pith_short_8: SWJPK2UZ

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/SWJPK2UZGTC5ERXYS3NTYFQA45 \
  | 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: 9592f56a9934c5d246f896db3c1600e74b23ec0bba36271d675c071543e4194b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d161e9d8d69771e76d3da69d859e9ea30857ebadc236c9d0d9b80b2e26839dea",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NT",
    "submitted_at": "2019-01-17T13:46:01Z",
    "title_canon_sha256": "bbef6df3188f17cd880c449c1574092fba70304f95d5f1b0384262ffefc2eec6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.05785",
    "kind": "arxiv",
    "version": 1
  }
}