Pith Number

pith:7RYZ4K7E

pith:2017:7RYZ4K7EDDM3JLB2ZQR5SYI26Q

not attested not anchored not stored refs pending

Correlation matrices, Clifford algebras, and completely positive semidefinite rank

Antonios Varvitsiotis, Anupam Prakash

arxiv:1702.06305 v2 · 2017-02-21 · math.OC

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7RYZ4K7EDDM3JLB2ZQR5SYI26Q}

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	2026-05-18T00:04:37.672385Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc719e2be418d9b4ac3acc23d9611af425b2656b3e5d8993445fba6a5bd2306c

Aliases

arxiv: 1702.06305 · arxiv_version: 1702.06305v2 · doi: 10.48550/arxiv.1702.06305 · pith_short_12: 7RYZ4K7EDDM3 · pith_short_16: 7RYZ4K7EDDM3JLB2 · pith_short_8: 7RYZ4K7E

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/7RYZ4K7EDDM3JLB2ZQR5SYI26Q \
  | 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: fc719e2be418d9b4ac3acc23d9611af425b2656b3e5d8993445fba6a5bd2306c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3900730a2eb3ef965ce351eb7785f4f0cd93f2d6af2a387af25252bc5e25f635",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2017-02-21T09:29:27Z",
    "title_canon_sha256": "4d65e1acc09dd197d95187974c53f4d09623702feda49e896748991095617156"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1702.06305",
    "kind": "arxiv",
    "version": 2
  }
}