Pith Number

pith:4M42H2UI

pith:2011:4M42H2UIWSWE57WUP25TRAGRKN

not attested not anchored not stored refs pending

Unfolding Orthogonal Polyhedra with Quadratic Refinement: The Delta-Unfolding Algorithm

Erik Demaine, Mirela Damian, Robin Flatland

arxiv:1112.4791 v1 · 2011-12-20 · cs.CG · cs.DM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4M42H2UIWSWE57WUP25TRAGRKN}

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	2026-05-18T04:05:58.047205Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e339a3ea88b4ac4efed47ebb3880d15377ace4569505d8cba0b00403a8d805bb

Aliases

arxiv: 1112.4791 · arxiv_version: 1112.4791v1 · doi: 10.48550/arxiv.1112.4791 · pith_short_12: 4M42H2UIWSWE · pith_short_16: 4M42H2UIWSWE57WU · pith_short_8: 4M42H2UI

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/4M42H2UIWSWE57WUP25TRAGRKN \
  | 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: e339a3ea88b4ac4efed47ebb3880d15377ace4569505d8cba0b00403a8d805bb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "71e3f14c3996c073dcc931e88587d00c019987fa3917743a46553fdb7e12e134",
    "cross_cats_sorted": [
      "cs.DM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CG",
    "submitted_at": "2011-12-20T18:26:24Z",
    "title_canon_sha256": "43a274a85a0d2ea5ea672f307fc911339de23d79a784be4d49bef69a509df6aa"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1112.4791",
    "kind": "arxiv",
    "version": 1
  }
}