Pith Number

pith:EQQQHNCS

pith:2013:EQQQHNCSKXZD2RECU4NI4UIW7L

not attested not anchored not stored refs pending

On the sign patterns of the smallest signless Laplacian eigenvector

Felix Goldberg, Steve Kirkland

arxiv:1307.7749 v1 · 2013-07-29 · 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{EQQQHNCSKXZD2RECU4NI4UIW7L}

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	2026-05-18T03:17:13.716603Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

242103b45255f23d4482a71a8e5116fac0603371ccc8372485c9fe1fcc0a8609

Aliases

arxiv: 1307.7749 · arxiv_version: 1307.7749v1 · doi: 10.48550/arxiv.1307.7749 · pith_short_12: EQQQHNCSKXZD · pith_short_16: EQQQHNCSKXZD2REC · pith_short_8: EQQQHNCS

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/EQQQHNCSKXZD2RECU4NI4UIW7L \
  | 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: 242103b45255f23d4482a71a8e5116fac0603371ccc8372485c9fe1fcc0a8609

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4ddd5c95a3720a4e5b7c8063b076029c903a7f5a6d189ae4dabe4e9e7b811030",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2013-07-29T21:54:04Z",
    "title_canon_sha256": "d4bf9a2a882ea7cb78f32d6eeeaaedcda33a098b2d19f802ae753f73811b2f40"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1307.7749",
    "kind": "arxiv",
    "version": 1
  }
}