Pith Number

pith:HUMAAWPU

pith:2017:HUMAAWPU5WIFWI3IXKVPHW7GIE

not attested not anchored not stored refs pending

Almost Hadamard matrices with complex entries

Ion Nechita, Teodor Banica

arxiv:1702.02220 v1 · 2017-02-07 · 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{HUMAAWPU5WIFWI3IXKVPHW7GIE}

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	2026-05-18T00:44:38.565054Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3d180059f4ed905b2368baaaf3dbe6412ddf09434f7400f2cfa17443d2bcf37f

Aliases

arxiv: 1702.02220 · arxiv_version: 1702.02220v1 · doi: 10.48550/arxiv.1702.02220 · pith_short_12: HUMAAWPU5WIF · pith_short_16: HUMAAWPU5WIFWI3I · pith_short_8: HUMAAWPU

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/HUMAAWPU5WIFWI3IXKVPHW7GIE \
  | 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: 3d180059f4ed905b2368baaaf3dbe6412ddf09434f7400f2cfa17443d2bcf37f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "052ab4b345f7084a8737ae03e2ddb95ced283bd7a8a258009746ce12436d6df2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2017-02-07T22:51:27Z",
    "title_canon_sha256": "b4cc453ba1dca224d604f8a0faf57a20a14b1052e27179b8a5e361e7fd383e9e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1702.02220",
    "kind": "arxiv",
    "version": 1
  }
}