Pith Number

pith:E7GPEPYM

pith:2015:E7GPEPYMWU7BU77ZRECFS2GXPJ

not attested not anchored not stored refs pending

A Closer Look At Differential Evolution For The Optimal Well Placement Problem

Colin G. Farquharson, Grazieli L. C. Carosio, Ronald D. Haynes, Thomas D. Humphries

arxiv:1504.06871 v1 · 2015-04-26 · 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{E7GPEPYMWU7BU77ZRECFS2GXPJ}

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	2026-05-18T02:17:44.200764Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

27ccf23f0cb53e1a7ff989045968d77a7438bc4ab2b6f67c93cc1f63de624fec

Aliases

arxiv: 1504.06871 · arxiv_version: 1504.06871v1 · doi: 10.48550/arxiv.1504.06871 · pith_short_12: E7GPEPYMWU7B · pith_short_16: E7GPEPYMWU7BU77Z · pith_short_8: E7GPEPYM

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/E7GPEPYMWU7BU77ZRECFS2GXPJ \
  | 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: 27ccf23f0cb53e1a7ff989045968d77a7438bc4ab2b6f67c93cc1f63de624fec

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "be6c4dc41eddf1e44fa00f15e7f1fcc6bfddb1518fe51e0a111e3bb1ffe95e79",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2015-04-26T19:29:30Z",
    "title_canon_sha256": "08234d412f89f30263460d4450ee57591049186fe8411000954921ed23944b7f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.06871",
    "kind": "arxiv",
    "version": 1
  }
}