Pith Number

pith:EFIM45PH

pith:2009:EFIM45PH2HQ75AQOCFW3LT56RD

not attested not anchored not stored refs pending

The isomorphism problem of planar polygon spaces

Dirk Schuetz

arxiv:0906.4499 v1 · 2009-06-24 · math.GT · math.AT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EFIM45PH2HQ75AQOCFW3LT56RD}

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	2026-05-18T02:58:03.033138Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2150ce75e7d1e1fe820e116db5cfbe88e08d929a802aec55ab18cf73458a5550

Aliases

arxiv: 0906.4499 · arxiv_version: 0906.4499v1 · doi: 10.48550/arxiv.0906.4499 · pith_short_12: EFIM45PH2HQ7 · pith_short_16: EFIM45PH2HQ75AQO · pith_short_8: EFIM45PH

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/EFIM45PH2HQ75AQOCFW3LT56RD \
  | 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: 2150ce75e7d1e1fe820e116db5cfbe88e08d929a802aec55ab18cf73458a5550

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cc26ddff6dc578fa90f3994c37e57e08031013be9c3aabb80e6dca1a181c8006",
    "cross_cats_sorted": [
      "math.AT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2009-06-24T15:16:42Z",
    "title_canon_sha256": "c2ebdce2449f6a7a18ee01869a2578848220a4110fcdf88363b582b9a4a2d069"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0906.4499",
    "kind": "arxiv",
    "version": 1
  }
}