Pith Number

pith:UTQSSBYY

pith:2010:UTQSSBYYZ2V6ZOSYRM47IM2NHS

not attested not anchored not stored refs pending

Topological representation of matroids from diagrams of spaces

Alexander Engstrom

arxiv:1002.3441 v3 · 2010-02-18 · math.CO · math.AT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UTQSSBYYZ2V6ZOSYRM47IM2NHS}

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	2026-05-18T02:24:38.772480Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a4e1290718ceabecba588b39f4334d3ca7491169bc67690fef92a94a64e9b48b

Aliases

arxiv: 1002.3441 · arxiv_version: 1002.3441v3 · doi: 10.48550/arxiv.1002.3441 · pith_short_12: UTQSSBYYZ2V6 · pith_short_16: UTQSSBYYZ2V6ZOSY · pith_short_8: UTQSSBYY

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/UTQSSBYYZ2V6ZOSYRM47IM2NHS \
  | 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: a4e1290718ceabecba588b39f4334d3ca7491169bc67690fef92a94a64e9b48b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e8f3e57b29e3bab474c4a43f827030e3df022c0a2da18f5da937dcc75f57de65",
    "cross_cats_sorted": [
      "math.AT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2010-02-18T07:48:42Z",
    "title_canon_sha256": "d2680d673625fb5aa177a0241e6815aa3a734247c0e092a89481dfcf0e14351b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1002.3441",
    "kind": "arxiv",
    "version": 3
  }
}