Pith Number

pith:RKQJUBCQ

pith:2018:RKQJUBCQYJS7KBWWSKWK6Y4VNG

not attested not anchored not stored refs pending

Proto-exact categories of matroids, Hall algebras, and K-theory

Christopher Eppolito, Jaiung Jun, Matt Szczesny

arxiv:1805.02281 v1 · 2018-05-06 · math.CT · math.AT · math.CO · math.RT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RKQJUBCQYJS7KBWWSKWK6Y4VNG}

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	2026-05-18T00:16:40.325205Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8aa09a0450c265f506d692acaf639569b67a13062f594fd4d7d908dcf70ee8c8

Aliases

arxiv: 1805.02281 · arxiv_version: 1805.02281v1 · doi: 10.48550/arxiv.1805.02281 · pith_short_12: RKQJUBCQYJS7 · pith_short_16: RKQJUBCQYJS7KBWW · pith_short_8: RKQJUBCQ

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/RKQJUBCQYJS7KBWWSKWK6Y4VNG \
  | 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: 8aa09a0450c265f506d692acaf639569b67a13062f594fd4d7d908dcf70ee8c8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7fd1713f7661d59a3f4ac770ce695a280ee687f74ce8d8981bbbc42673443e0b",
    "cross_cats_sorted": [
      "math.AT",
      "math.CO",
      "math.RT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CT",
    "submitted_at": "2018-05-06T21:47:42Z",
    "title_canon_sha256": "21c1ff1a4c72c2cb4d5c3380759f75635fe9050c16cb45aa8917191231210ac2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1805.02281",
    "kind": "arxiv",
    "version": 1
  }
}