Pith Number

pith:O7BMMRQ5

pith:2018:O7BMMRQ5UEGVDE33H5NWWD2EFG

not attested not anchored not stored refs pending

A "poor man's" approach to topology optimization of natural convection problems

Casper Schousboe Andreasen, Janus Asmussen, Joe Alexandersen, Ole Sigmund

arxiv:1809.01900 v2 · 2018-09-06 · cs.CE

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{O7BMMRQ5UEGVDE33H5NWWD2EFG}

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	2026-05-17T23:53:42.126285Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

77c2c6461da10d51937b3f5b6b0f442992427a5764bdd464055435d5870191b2

Aliases

arxiv: 1809.01900 · arxiv_version: 1809.01900v2 · doi: 10.48550/arxiv.1809.01900 · pith_short_12: O7BMMRQ5UEGV · pith_short_16: O7BMMRQ5UEGVDE33 · pith_short_8: O7BMMRQ5

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/O7BMMRQ5UEGVDE33H5NWWD2EFG \
  | 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: 77c2c6461da10d51937b3f5b6b0f442992427a5764bdd464055435d5870191b2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b184d8c3526cf722ae636e1df4178444dc611c50831dffc836144a7879db1f10",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CE",
    "submitted_at": "2018-09-06T09:31:21Z",
    "title_canon_sha256": "74540ce11d07cfd46299dee97833936b48884da44340041296815c21a07d4e4b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1809.01900",
    "kind": "arxiv",
    "version": 2
  }
}