Pith Number

pith:Q34MHCRN

pith:2013:Q34MHCRN27GK4VWLGFBEAFXAK6

not attested not anchored not stored refs pending

Resolving rational cohomological dimension via a Cantor group action

Michael Levin

arxiv:1309.7489 v1 · 2013-09-28 · math.GT · math.GN

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Q34MHCRN27GK4VWLGFBEAFXAK6}

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	2026-05-18T01:31:46.805906Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

86f8c38a2dd7ccae56cb31424016e0578c9efc134424fd705fd60129b3d278ec

Aliases

arxiv: 1309.7489 · arxiv_version: 1309.7489v1 · doi: 10.48550/arxiv.1309.7489 · pith_short_12: Q34MHCRN27GK · pith_short_16: Q34MHCRN27GK4VWL · pith_short_8: Q34MHCRN

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/Q34MHCRN27GK4VWLGFBEAFXAK6 \
  | 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: 86f8c38a2dd7ccae56cb31424016e0578c9efc134424fd705fd60129b3d278ec

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a19a5d86155482d420955a8070b457a11b813cb4479b3630689021ef6ed159aa",
    "cross_cats_sorted": [
      "math.GN"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2013-09-28T18:46:48Z",
    "title_canon_sha256": "462b1546e6deef1f42ce94a3cec262dcc02ecae9a1e82ef208d21e5d105bacfc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1309.7489",
    "kind": "arxiv",
    "version": 1
  }
}