Pith Number

pith:QNGU2Q7C

pith:2016:QNGU2Q7CCQHTWMYPWQD5SFXABU

not attested not anchored not stored refs pending

Characteristic classes as complete obstructions

Martina Rovelli

arxiv:1610.08893 v3 · 2016-10-27 · 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{QNGU2Q7CCQHTWMYPWQD5SFXABU}

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	2026-05-18T00:03:29.745791Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

834d4d43e2140f3b330fb407d916e00d07dcdfe67842f858ed3240d45a075cb3

Aliases

arxiv: 1610.08893 · arxiv_version: 1610.08893v3 · doi: 10.48550/arxiv.1610.08893 · pith_short_12: QNGU2Q7CCQHT · pith_short_16: QNGU2Q7CCQHTWMYP · pith_short_8: QNGU2Q7C

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/QNGU2Q7CCQHTWMYPWQD5SFXABU \
  | 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: 834d4d43e2140f3b330fb407d916e00d07dcdfe67842f858ed3240d45a075cb3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "69dd9d55cd4f6eb454dce1d24fec9e9a80074f7065cf38617240864e53c32c73",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2016-10-27T17:30:52Z",
    "title_canon_sha256": "a80eee1458e068b828fcb1d7bf26a3550b91383e0ae59e97afce972b75c41c31"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1610.08893",
    "kind": "arxiv",
    "version": 3
  }
}