Pith Number

pith:EECNFKWV

pith:2018:EECNFKWV63ETZDNV3JDDXXCI3U

not attested not anchored not stored refs pending

Finding simple curves in surface covers is undecidable

Ingrid Irmer

arxiv:1806.03700 v2 · 2018-06-10 · math.GT · math.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EECNFKWV63ETZDNV3JDDXXCI3U}

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	2026-05-18T00:07:40.255739Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2104d2aad5f6c93c8db5da463bdc48dd1fe982968f18e71f14b9ccf09eee15de

Aliases

arxiv: 1806.03700 · arxiv_version: 1806.03700v2 · doi: 10.48550/arxiv.1806.03700 · pith_short_12: EECNFKWV63ET · pith_short_16: EECNFKWV63ETZDNV · pith_short_8: EECNFKWV

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/EECNFKWV63ETZDNV3JDDXXCI3U \
  | 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: 2104d2aad5f6c93c8db5da463bdc48dd1fe982968f18e71f14b9ccf09eee15de

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "411b94bd5f50205505720c4e669064bf891dcce052b0bdd59ad0e09b854541c4",
    "cross_cats_sorted": [
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2018-06-10T18:19:28Z",
    "title_canon_sha256": "919820238e22cc681f3cd2ed996e11eaeb0e404440f5979d680e042f8202dcae"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1806.03700",
    "kind": "arxiv",
    "version": 2
  }
}