Pith Number

pith:BR2W2AMT

pith:2013:BR2W2AMTXW2B7WZKH47HEBTHA6

not attested not anchored not stored refs pending

On the structure of fundamental groups of conic-line arrangements having a cycle in their graph

David Garber, Michael Friedman

arxiv:1304.7561 v1 · 2013-04-29 · 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{BR2W2AMTXW2B7WZKH47HEBTHA6}

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	2026-05-18T03:26:53.650847Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0c756d0193bdb41fdb2a3f3e7206670791cdcd514ddfa1ac783575ddf4360090

Aliases

arxiv: 1304.7561 · arxiv_version: 1304.7561v1 · doi: 10.48550/arxiv.1304.7561 · pith_short_12: BR2W2AMTXW2B · pith_short_16: BR2W2AMTXW2B7WZK · pith_short_8: BR2W2AMT

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/BR2W2AMTXW2B7WZKH47HEBTHA6 \
  | 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: 0c756d0193bdb41fdb2a3f3e7206670791cdcd514ddfa1ac783575ddf4360090

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7fa1d098556b3cc0c730eac9c01f9cac52e765c9f3b6eb9d5c4601de827420b2",
    "cross_cats_sorted": [
      "math.AT",
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2013-04-29T04:38:27Z",
    "title_canon_sha256": "9fa954f12b52caf94410433e52ab3ff42aff0f20378f8027e43235aa61ad4906"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.7561",
    "kind": "arxiv",
    "version": 1
  }
}