Pith Number

pith:N3EIBCXP

pith:2012:N3EIBCXPY6YP5JLKJTNG5MRFAN

not attested not anchored not stored refs pending

An isoperimetric result for the fundamental frequency via domain derivative

Carlo Nitsch

arxiv:1201.5328 v2 · 2012-01-25 · 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{N3EIBCXPY6YP5JLKJTNG5MRFAN}

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	2026-05-18T04:03:34.387032Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6ec8808aefc7b0fea56a4cda6eb2250348d1d71c7250d77d91b7149d5c08afbc

Aliases

arxiv: 1201.5328 · arxiv_version: 1201.5328v2 · doi: 10.48550/arxiv.1201.5328 · pith_short_12: N3EIBCXPY6YP · pith_short_16: N3EIBCXPY6YP5JLK · pith_short_8: N3EIBCXP

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/N3EIBCXPY6YP5JLKJTNG5MRFAN \
  | 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: 6ec8808aefc7b0fea56a4cda6eb2250348d1d71c7250d77d91b7149d5c08afbc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "eb97e628d5c543c4801ae7f7588aab8ff16020a7f527a0256aa67c748133e37c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2012-01-25T17:17:39Z",
    "title_canon_sha256": "d23d5a8296ffa19f4959fb07f7171b614f1f6e9b02860e5c56b87b3a9896a383"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1201.5328",
    "kind": "arxiv",
    "version": 2
  }
}