Pith Number

pith:R2XYA5DC

pith:2015:R2XYA5DCOR22NNHA45NJK7KCIW

not attested not anchored not stored refs pending

On the closure of the completely positive semidefinite cone and linear approximations to quantum colorings

Monique Laurent, Sabine Burgdorf, Teresa Piovesan

arxiv:1502.02842 v1 · 2015-02-10 · math.OC · math.OA · quant-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{R2XYA5DCOR22NNHA45NJK7KCIW}

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	2026-05-18T02:27:30.722912Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8eaf8074627475a6b4e0e75a957d4245994f0c48d72c1260fead393f74bae694

Aliases

arxiv: 1502.02842 · arxiv_version: 1502.02842v1 · doi: 10.48550/arxiv.1502.02842 · pith_short_12: R2XYA5DCOR22 · pith_short_16: R2XYA5DCOR22NNHA · pith_short_8: R2XYA5DC

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/R2XYA5DCOR22NNHA45NJK7KCIW \
  | 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: 8eaf8074627475a6b4e0e75a957d4245994f0c48d72c1260fead393f74bae694

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d175ea2c95ab07d74d8f86827ef092d09ca98b81d6646a3174c648b0ac302ea7",
    "cross_cats_sorted": [
      "math.OA",
      "quant-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2015-02-10T10:30:45Z",
    "title_canon_sha256": "6971ff27094c3798ab113747b13174ac0047519790a4f17ff5b7158183b57205"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1502.02842",
    "kind": "arxiv",
    "version": 1
  }
}