Pith Number

pith:7UB2N73F

pith:2009:7UB2N73FP3272OSPX2QYVEDKT7

not attested not anchored not stored refs pending

Plane sextics with a type $\bold E_8$ singular point

Alex Degtyarev

arxiv:0902.2281 v1 · 2009-02-13 · 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{7UB2N73FP3272OSPX2QYVEDKT7}

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	2026-05-18T01:22:49.366574Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fd03a6ff657ef5fd3a4fbea18a906a9fdf032febedf973fc204931478097918e

Aliases

arxiv: 0902.2281 · arxiv_version: 0902.2281v1 · doi: 10.48550/arxiv.0902.2281 · pith_short_12: 7UB2N73FP327 · pith_short_16: 7UB2N73FP3272OSP · pith_short_8: 7UB2N73F

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/7UB2N73FP3272OSPX2QYVEDKT7 \
  | 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: fd03a6ff657ef5fd3a4fbea18a906a9fdf032febedf973fc204931478097918e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1cf7622e29d1dc98b07e461f820d0df36497dd324ec375f83de18844848bdcc6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2009-02-13T09:39:17Z",
    "title_canon_sha256": "d744b2864b52c89e346fb2cffff62c68ed407baae44ca5f65c314d1159160e46"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.2281",
    "kind": "arxiv",
    "version": 1
  }
}