Pith Number

pith:ZDAUSMDA

pith:2020:ZDAUSMDAIX2KYE76VMWWQTVKSM

not attested not anchored not stored refs pending

Compact 200 line MATLAB code for inverse design in photonics by topology optimization: tutorial

Ole Sigmund, Rasmus E. Christiansen

arxiv:2009.14276 v5 · 2020-08-23 · cs.MS · cs.CE · physics.optics

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZDAUSMDAIX2KYE76VMWWQTVKSM}

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	2026-07-05T02:17:35.143186Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c8c149306045f4ac13feab2d684eaa931866834ce4981e6cb50fa6a905352c45

Aliases

arxiv: 2009.14276 · arxiv_version: 2009.14276v5 · doi: 10.48550/arxiv.2009.14276 · pith_short_12: ZDAUSMDAIX2K · pith_short_16: ZDAUSMDAIX2KYE76 · pith_short_8: ZDAUSMDA

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/ZDAUSMDAIX2KYE76VMWWQTVKSM \
  | 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: c8c149306045f4ac13feab2d684eaa931866834ce4981e6cb50fa6a905352c45

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "828084bf28f6c0ba97c69eeda16ef2621ade4444e3672a3276168c618387ee6c",
    "cross_cats_sorted": [
      "cs.CE",
      "physics.optics"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.MS",
    "submitted_at": "2020-08-23T14:07:07Z",
    "title_canon_sha256": "c04d120050187cc92f8d760a4006e5f7ffee69863bffaf96e8abbe1db2d824f9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2009.14276",
    "kind": "arxiv",
    "version": 5
  }
}