Pith Number

pith:DCI2JHWT

pith:2021:DCI2JHWTWVPLB6757IQJSZIZ37

not attested not anchored not stored refs pending

Rational homotopy and simply-connected 8-manifolds

Csaba Nagy, Johannes Nordstr\"om

arxiv:2105.13660 v2 · 2021-05-28 · math.AT · math.GT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DCI2JHWTWVPLB6757IQJSZIZ37}

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	2026-07-05T02:54:40.343601Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1891a49ed3b55eb0fbfdfa20996519dffd8fe340a96ba97eba8bb027e2f7a33b

Aliases

arxiv: 2105.13660 · arxiv_version: 2105.13660v2 · doi: 10.48550/arxiv.2105.13660 · pith_short_12: DCI2JHWTWVPL · pith_short_16: DCI2JHWTWVPLB675 · pith_short_8: DCI2JHWT

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/DCI2JHWTWVPLB6757IQJSZIZ37 \
  | 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: 1891a49ed3b55eb0fbfdfa20996519dffd8fe340a96ba97eba8bb027e2f7a33b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "afb140ea7508d04ee0765c5a11c0387d4db563d3c751db823b8537260eb9bd53",
    "cross_cats_sorted": [
      "math.GT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2021-05-28T08:14:08Z",
    "title_canon_sha256": "d255bc5aae1fd6fcf0c8d3ea926a5d7f33ca8a7dc93ff816fe07e9c3e321cff7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2105.13660",
    "kind": "arxiv",
    "version": 2
  }
}