Pith Number

pith:3EZEU56K

pith:2013:3EZEU56KCZBMCP7NZ25PT3IPX5

not attested not anchored not stored refs pending

On eigenvalues of Seidel matrices and Haemers' conjecture

Ebrahim Ghorbani

arxiv:1301.0075 v1 · 2013-01-01 · 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{3EZEU56KCZBMCP7NZ25PT3IPX5}

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	2026-05-18T03:37:28.333669Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d9324a77ca1642c13fedcebaf9ed0fbf6bca98e412a1e77bd1c4aff5f6d19cba

Aliases

arxiv: 1301.0075 · arxiv_version: 1301.0075v1 · doi: 10.48550/arxiv.1301.0075 · pith_short_12: 3EZEU56KCZBM · pith_short_16: 3EZEU56KCZBMCP7N · pith_short_8: 3EZEU56K

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/3EZEU56KCZBMCP7NZ25PT3IPX5 \
  | 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: d9324a77ca1642c13fedcebaf9ed0fbf6bca98e412a1e77bd1c4aff5f6d19cba

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9f62858a01d6201d7cb0eff5a92c70ddd29f31d4d73f7e02995cabbb83feb128",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2013-01-01T11:25:08Z",
    "title_canon_sha256": "63893533bd36aa9e51b4572e9fee9d8ef950826c7503f8a82be4acdcee501d23"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1301.0075",
    "kind": "arxiv",
    "version": 1
  }
}