Pith Number

pith:4X3U7IZ7

pith:2021:4X3U7IZ7JBZGNND4YOMY7TNTUA

not attested not anchored not stored refs pending

OPM, a collection of Optimization Problems in Matlab

Philippe L. Toint, Serge Gratton

arxiv:2112.05636 v2 · 2021-12-10 · 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{4X3U7IZ7JBZGNND4YOMY7TNTUA}

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.

Cited by

1 paper in Pith

Enhancing finite-difference based derivative-free optimization methods with machine learning

Receipt and verification

First computed	2026-07-05T10:01:29.870999Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e5f74fa33f487266b47cc3998fcdb3a026a7ba992b14256d0faa0d24906d43c2

Aliases

arxiv: 2112.05636 · arxiv_version: 2112.05636v2 · doi: 10.48550/arxiv.2112.05636 · pith_short_12: 4X3U7IZ7JBZG · pith_short_16: 4X3U7IZ7JBZGNND4 · pith_short_8: 4X3U7IZ7

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/4X3U7IZ7JBZGNND4YOMY7TNTUA \
  | 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: e5f74fa33f487266b47cc3998fcdb3a026a7ba992b14256d0faa0d24906d43c2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "36f3da119b064e15ea41df410fba80868b408f49a21da4a74788b8fddf321c1f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2021-12-10T16:10:00Z",
    "title_canon_sha256": "875786d83325b4d0651db41333c81cf5d74e32ef77d3409a1a1d2fb5dcd7a445"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2112.05636",
    "kind": "arxiv",
    "version": 2
  }
}