Pith Number

pith:B3LZXTFV

pith:2008:B3LZXTFVITHAHBHI3YR77J2ZW7

not attested not anchored not stored refs pending

On non Fundamental Group Equivalent Surfaces

Michael Friedman, Mina Teicher

arxiv:0802.2338 v1 · 2008-02-16 · 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{B3LZXTFVITHAHBHI3YR77J2ZW7}

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	2026-05-18T02:41:51.771536Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0ed79bccb544ce0384e8de23ffa759b7c2e844dfb91bc4f9f3d856f95eccbdc5

Aliases

arxiv: 0802.2338 · arxiv_version: 0802.2338v1 · doi: 10.48550/arxiv.0802.2338 · pith_short_12: B3LZXTFVITHA · pith_short_16: B3LZXTFVITHAHBHI · pith_short_8: B3LZXTFV

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/B3LZXTFVITHAHBHI3YR77J2ZW7 \
  | 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: 0ed79bccb544ce0384e8de23ffa759b7c2e844dfb91bc4f9f3d856f95eccbdc5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e001463eb99b1429067dfde1bb41ed75f9eab0e5d8b247c2bde2a0ae0c49610a",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/publicdomain/",
    "primary_cat": "math.AG",
    "submitted_at": "2008-02-16T17:17:43Z",
    "title_canon_sha256": "bacf160e0c20cb1b7a1cda1cb2c6d6ed6f3d1c278178e1032ac1be4f7302a3eb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0802.2338",
    "kind": "arxiv",
    "version": 1
  }
}