Pith Number

pith:EQJ2XPPS

pith:2019:EQJ2XPPSCRIBPG67FUEXIOSZRT

not attested not anchored not stored refs pending

Integer Laplacian Eigenvalues of Chordal Graphs

Claudia Marcela Justel, Lilian Markenzon, Nair Maria Maia de Abreu

arxiv:1907.04979 v1 · 2019-07-11 · cs.DM · 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{EQJ2XPPSCRIBPG67FUEXIOSZRT}

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	2026-05-17T23:40:54.295733Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2413abbdf21450179bdf2d09743a598cd7ff23a4367468da514984531cd8a1e6

Aliases

arxiv: 1907.04979 · arxiv_version: 1907.04979v1 · doi: 10.48550/arxiv.1907.04979 · pith_short_12: EQJ2XPPSCRIB · pith_short_16: EQJ2XPPSCRIBPG67 · pith_short_8: EQJ2XPPS

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/EQJ2XPPSCRIBPG67FUEXIOSZRT \
  | 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: 2413abbdf21450179bdf2d09743a598cd7ff23a4367468da514984531cd8a1e6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "613feccb0f27a8b25f8c5b4e037630f0ee3dd18f6ef3614c9f6c3d816296c993",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2019-07-11T03:02:59Z",
    "title_canon_sha256": "c4964f66416b85d8a4dc5f9f1e98cc298962105c38f33525d39fbce5cabb32a5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.04979",
    "kind": "arxiv",
    "version": 1
  }
}