Pith Number

pith:AE2Y7P5Y

pith:2011:AE2Y7P5YVSLA2A6IT5JGM7DGQY

not attested not anchored not stored refs pending

On the structure of conjugation-free fundamental groups of conic-line arrangements

David Garber, Michael Friedman

arxiv:1111.5291 v4 · 2011-11-22 · math.GT · math.AT · 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{AE2Y7P5YVSLA2A6IT5JGM7DGQY}

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	2026-05-18T03:27:01.824575Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

01358fbfb8ac960d03c89f52667c6686345d6189a63162e981200e62792a6c98

Aliases

arxiv: 1111.5291 · arxiv_version: 1111.5291v4 · doi: 10.48550/arxiv.1111.5291 · pith_short_12: AE2Y7P5YVSLA · pith_short_16: AE2Y7P5YVSLA2A6I · pith_short_8: AE2Y7P5Y

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/AE2Y7P5YVSLA2A6IT5JGM7DGQY \
  | 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: 01358fbfb8ac960d03c89f52667c6686345d6189a63162e981200e62792a6c98

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d2711fc377281f9977e67f63567e91110cc46a142335885b777518b593ee30d9",
    "cross_cats_sorted": [
      "math.AT",
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2011-11-22T19:20:26Z",
    "title_canon_sha256": "bcb81653f07b4589506c5924a60d9e6606f10f0f6864b29b2e06db4d9319c182"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1111.5291",
    "kind": "arxiv",
    "version": 4
  }
}