Pith Number

pith:B4VAITWS

pith:2006:B4VAITWSE52DN3AJWFLBMBX3OM

not attested not anchored not stored refs pending

A matroid invariant via the K-theory of the Grassmannian

David E Speyer

arxiv:math/0603551 v1 · 2006-03-23 · math.AG · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{B4VAITWSE52DN3AJWFLBMBX3OM}

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.

Cited by

1 paper in Pith

Hepp's bound for Feynman graphs and matroids

Receipt and verification

First computed	2026-07-04T14:54:00.549578Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0f2a044ed2277436ec09b1561606fb73285879eb1982e6e260fa87b3b9ad91f1

Aliases

arxiv: math/0603551 · arxiv_version: math/0603551v1 · doi: 10.48550/arxiv.math/0603551 · pith_short_12: B4VAITWSE52D · pith_short_16: B4VAITWSE52DN3AJ · pith_short_8: B4VAITWS

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/B4VAITWSE52DN3AJWFLBMBX3OM \
  | 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: 0f2a044ed2277436ec09b1561606fb73285879eb1982e6e260fa87b3b9ad91f1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c4eda7401c9da557c220dbfe67e505a87d8481eed962d170f87869072de4290e",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "",
    "primary_cat": "math.AG",
    "submitted_at": "2006-03-23T15:42:15Z",
    "title_canon_sha256": "d956563b0f62ea14a04f3ee4d1f2caf8b4b35b002cd3b522e80abad7f62db7ab"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0603551",
    "kind": "arxiv",
    "version": 1
  }
}