Pith Number

pith:X2EWKWYL

pith:2013:X2EWKWYLBJ7KOXDYLZ5BAGFMQX

not attested not anchored not stored refs pending

On special quadratic birational transformations of a projective space

Giovanni Staglian\`o

arxiv:1302.5579 v1 · 2013-02-22 · 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{X2EWKWYLBJ7KOXDYLZ5BAGFMQX}

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	2026-05-18T03:32:46.374903Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

be89655b0b0a7ea75c785e7a1018ac85faabe2b224fac776dba00925a8b0edfa

Aliases

arxiv: 1302.5579 · arxiv_version: 1302.5579v1 · doi: 10.48550/arxiv.1302.5579 · pith_short_12: X2EWKWYLBJ7K · pith_short_16: X2EWKWYLBJ7KOXDY · pith_short_8: X2EWKWYL

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/X2EWKWYLBJ7KOXDYLZ5BAGFMQX \
  | 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: be89655b0b0a7ea75c785e7a1018ac85faabe2b224fac776dba00925a8b0edfa

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4df266fbe4ae221e16959a688e93073cc8301578a04a24fc26bd32e4e419466f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2013-02-22T13:20:35Z",
    "title_canon_sha256": "5acf52bce905c7d6724dc9778d4d92674b8cc3a95c112b85ac913a1717fdce13"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1302.5579",
    "kind": "arxiv",
    "version": 1
  }
}