Pith Number

pith:IPCQ4ZXJ

pith:2020:IPCQ4ZXJ3CU2OW2GQWKX3ZEORS

not attested not anchored not stored refs pending

On Degenerate Doubly Nonnegative Projection Problems

Defeng Sun, Kim-Chuan Toh, Ling Liang, Ying Cui

arxiv:2009.11272 v2 · 2020-09-23 · 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{IPCQ4ZXJ3CU2OW2GQWKX3ZEORS}

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	2026-07-05T03:10:37.479513Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

43c50e66e9d8a9a75b4685957de48e8c9c550b21aea1805e362b959df92bb2fe

Aliases

arxiv: 2009.11272 · arxiv_version: 2009.11272v2 · doi: 10.48550/arxiv.2009.11272 · pith_short_12: IPCQ4ZXJ3CU2 · pith_short_16: IPCQ4ZXJ3CU2OW2G · pith_short_8: IPCQ4ZXJ

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/IPCQ4ZXJ3CU2OW2GQWKX3ZEORS \
  | 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: 43c50e66e9d8a9a75b4685957de48e8c9c550b21aea1805e362b959df92bb2fe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "acdd9e7b35b344419087aee82e88bc7b0599fca17d74154329c781e16bc62633",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2020-09-23T17:34:44Z",
    "title_canon_sha256": "8cd4f39df64048051fbe92da73b73f0397af46e2e877ec6f40c724e70e6f5a98"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2009.11272",
    "kind": "arxiv",
    "version": 2
  }
}