Pith Number

pith:2QCAL3GN

pith:2007:2QCAL3GNXG5A6OK4MF7WY3R2LJ

not attested not anchored not stored refs pending

Varieties with quadratic entry locus, II

Francesco Russo, Paltin Ionescu

arxiv:math/0703531 v2 · 2007-03-18 · math.AG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2QCAL3GNXG5A6OK4MF7WY3R2LJ}

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	2026-05-18T03:02:21.752529Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d40405eccdb9ba0f395c617f6c6e3a5a6ded037e4950593cb206584b8521a7a4

Aliases

arxiv: math/0703531 · arxiv_version: math/0703531v2 · doi: 10.48550/arxiv.math/0703531 · pith_short_12: 2QCAL3GNXG5A · pith_short_16: 2QCAL3GNXG5A6OK4 · pith_short_8: 2QCAL3GN

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/2QCAL3GNXG5A6OK4MF7WY3R2LJ \
  | 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: d40405eccdb9ba0f395c617f6c6e3a5a6ded037e4950593cb206584b8521a7a4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e9e97571e5d626c2974b707179360392b001573aada26dd5728f82602da71b6f",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.AG",
    "submitted_at": "2007-03-18T22:57:23Z",
    "title_canon_sha256": "43a22d76085a3f8426952daf85d430f0c2c4482640fa24c39d60fc140d417ccc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0703531",
    "kind": "arxiv",
    "version": 2
  }
}