Pith Number

pith:4EMNBRDH

pith:2014:4EMNBRDHCUFJ2W23HJOXA3OOW7

not attested not anchored not stored refs pending

On the number of $r$-matchings in a Tree

Dong Yeap Kang, Hiu-Fai Law, Jaehoon Kim, Younjin Kim

arxiv:1409.7795 v2 · 2014-09-27 · 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{4EMNBRDHCUFJ2W23HJOXA3OOW7}

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	2026-05-18T02:35:46.907843Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e118d0c467150a9d5b5b3a5d706dceb7c8919fa7e087d0bdb74ab817ce93f031

Aliases

arxiv: 1409.7795 · arxiv_version: 1409.7795v2 · doi: 10.48550/arxiv.1409.7795 · pith_short_12: 4EMNBRDHCUFJ · pith_short_16: 4EMNBRDHCUFJ2W23 · pith_short_8: 4EMNBRDH

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/4EMNBRDHCUFJ2W23HJOXA3OOW7 \
  | 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: e118d0c467150a9d5b5b3a5d706dceb7c8919fa7e087d0bdb74ab817ce93f031

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e5fa8ffe02b9be4468902176cf35b8ad7312489abce3c80359afe517d91cad53",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2014-09-27T11:02:02Z",
    "title_canon_sha256": "5708c25ea200ffe8a5e08aa81faaee335ff9e579a4dc1bf4e70ed36214bdab97"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1409.7795",
    "kind": "arxiv",
    "version": 2
  }
}