Pith Number

pith:6OVBW7SL

pith:2019:6OVBW7SLDLE5PQGJHZX2L6I2IP

not attested not anchored not stored refs pending

Signless Laplacian eigenvalue problems of Nordhaus-Gaddum type

Huiqiu Lin, Xueyi Huang

arxiv:1904.13225 v1 · 2019-04-30 · 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{6OVBW7SLDLE5PQGJHZX2L6I2IP}

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	2026-05-17T23:47:21.878693Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f3aa1b7e4b1ac9d7c0c93e6fa5f91a43df9b6537c4f1e9332a35c1777a90573c

Aliases

arxiv: 1904.13225 · arxiv_version: 1904.13225v1 · doi: 10.48550/arxiv.1904.13225 · pith_short_12: 6OVBW7SLDLE5 · pith_short_16: 6OVBW7SLDLE5PQGJ · pith_short_8: 6OVBW7SL

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/6OVBW7SLDLE5PQGJHZX2L6I2IP \
  | 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: f3aa1b7e4b1ac9d7c0c93e6fa5f91a43df9b6537c4f1e9332a35c1777a90573c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0a084686782e103e97133c413553b6adf65b495505c4b8ef593e618cd3e5d538",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-04-30T13:35:53Z",
    "title_canon_sha256": "2439a4a9c74e274a4d9ed0c341f098b32b1d2335ab8d92bec0fb2406a8036360"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.13225",
    "kind": "arxiv",
    "version": 1
  }
}