Pith Number

pith:4ABVVHKL

pith:2018:4ABVVHKLCIXYTYLL4TL6EB4TUL

not attested not anchored not stored refs pending

Positive semidefinite approximations to the cone of copositive kernels

Juan C. Vera, Olga Kuryatnikova

arxiv:1812.00274 v1 · 2018-12-01 · 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{4ABVVHKLCIXYTYLL4TL6EB4TUL}

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	2026-05-17T23:59:21.702661Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e0035a9d4b122f89e16be4d7e20793a2c5101e799fab373d2bf7ae4e85757c93

Aliases

arxiv: 1812.00274 · arxiv_version: 1812.00274v1 · doi: 10.48550/arxiv.1812.00274 · pith_short_12: 4ABVVHKLCIXY · pith_short_16: 4ABVVHKLCIXYTYLL · pith_short_8: 4ABVVHKL

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/4ABVVHKLCIXYTYLL4TL6EB4TUL \
  | 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: e0035a9d4b122f89e16be4d7e20793a2c5101e799fab373d2bf7ae4e85757c93

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "de993b0bb14687356fe7f4dd95b6a798a299c18eb19c70ee6720d8c3ec1f18b3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2018-12-01T22:14:17Z",
    "title_canon_sha256": "911355563bc9a0021fa44115626021586b39517f2f83ec1a05bd2a7e73ff17d6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1812.00274",
    "kind": "arxiv",
    "version": 1
  }
}