Pith Number

pith:Y2BQRAR4

pith:2015:Y2BQRAR4Y56E7THPTSSPW4MREY

not attested not anchored not stored refs pending

On Computability and Triviality of Well Groups

Marek Krcal, Peter Franek

arxiv:1501.03641 v2 · 2015-01-15 · math.AT · cs.CG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Y2BQRAR4Y56E7THPTSSPW4MREY}

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	2026-05-18T02:20:19.517802Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c68308823cc77c4fccef9ca4fb7191261b0799808cf0b5a6517f45e2c301a169

Aliases

arxiv: 1501.03641 · arxiv_version: 1501.03641v2 · doi: 10.48550/arxiv.1501.03641 · pith_short_12: Y2BQRAR4Y56E · pith_short_16: Y2BQRAR4Y56E7THP · pith_short_8: Y2BQRAR4

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/Y2BQRAR4Y56E7THPTSSPW4MREY \
  | 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: c68308823cc77c4fccef9ca4fb7191261b0799808cf0b5a6517f45e2c301a169

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dd7317dad00fe9e6e29e72ad6f02ebd3024d331109d436ee900c3e8ecf2b438d",
    "cross_cats_sorted": [
      "cs.CG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2015-01-15T12:02:35Z",
    "title_canon_sha256": "a8d815cdede0fe4c71ab6d58a5227ea62725131c74855cfcc8509aa05fa2a51a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1501.03641",
    "kind": "arxiv",
    "version": 2
  }
}