Pith Number

pith:EWEVXFOB

pith:2011:EWEVXFOBKHDU6OMU7IH3RV44SL

not attested not anchored not stored refs pending

Sparse Sums of Positive Semidefinite Matrices

Cristiane M. Sato, Marcel K. de Carli Silva, Nicholas J. A. Harvey

arxiv:1107.0088 v2 · 2011-07-01 · cs.DM · cs.DS · cs.NA · 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{EWEVXFOBKHDU6OMU7IH3RV44SL}

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	2026-05-18T00:25:02.583862Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

25895b95c151c74f3994fa0fb8d79c92d0459259bf63eb861b66536e7f5bf7c6

Aliases

arxiv: 1107.0088 · arxiv_version: 1107.0088v2 · doi: 10.48550/arxiv.1107.0088 · pith_short_12: EWEVXFOBKHDU · pith_short_16: EWEVXFOBKHDU6OMU · pith_short_8: EWEVXFOB

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/EWEVXFOBKHDU6OMU7IH3RV44SL \
  | 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: 25895b95c151c74f3994fa0fb8d79c92d0459259bf63eb861b66536e7f5bf7c6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fae59238f2697dfee114a0448caed05590a4d58a98522ab7681a4f4fa1f5d41b",
    "cross_cats_sorted": [
      "cs.DS",
      "cs.NA",
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2011-07-01T00:36:03Z",
    "title_canon_sha256": "97d04080e8cc0c68318fa3a7a7eeea1ba12759f278321457dcc5bab4d897efff"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1107.0088",
    "kind": "arxiv",
    "version": 2
  }
}