Pith Number

pith:EWD7WHN5

pith:2008:EWD7WHN5SVRF7IN37YENRIS2KU

not attested not anchored not stored refs pending

Elements and cyclic subgroups of finite order of the Cremona group

J\'er\'emy Blanc

arxiv:0809.4673 v2 · 2008-09-26 · math.AG · math.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EWD7WHN5SVRF7IN37YENRIS2KU}

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	2026-05-18T04:05:16.070569Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2587fb1dbd95625fa1bbfe08d8a25a5519cdd3c156a710dfb7b19737f606a560

Aliases

arxiv: 0809.4673 · arxiv_version: 0809.4673v2 · doi: 10.48550/arxiv.0809.4673 · pith_short_12: EWD7WHN5SVRF · pith_short_16: EWD7WHN5SVRF7IN3 · pith_short_8: EWD7WHN5

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/EWD7WHN5SVRF7IN37YENRIS2KU \
  | 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: 2587fb1dbd95625fa1bbfe08d8a25a5519cdd3c156a710dfb7b19737f606a560

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "80c617b85369cb1e6ed5f840c36cbe9352c89c1bce422ccf0d3d11ba9df50c72",
    "cross_cats_sorted": [
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2008-09-26T17:13:45Z",
    "title_canon_sha256": "c70e45ce77c577387527637b0efdc2941e8cfc2754ed46dc158a6c0ad50ce441"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0809.4673",
    "kind": "arxiv",
    "version": 2
  }
}