Pith Number

pith:WXNMCRHK

pith:2009:WXNMCRHK4XEDUBDFWPWHTSHF7P

not attested not anchored not stored refs pending

Can one classify finite Postnikov pieces?

Jerome Scherer, Jesper M. Moller

arxiv:0908.3393 v1 · 2009-08-24 · 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{WXNMCRHK4XEDUBDFWPWHTSHF7P}

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	2026-05-18T03:59:14.163402Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b5dac144eae5c83a0465b3ec79c8e5fbe624329ec0ab0008a0cef078857043df

Aliases

arxiv: 0908.3393 · arxiv_version: 0908.3393v1 · doi: 10.48550/arxiv.0908.3393 · pith_short_12: WXNMCRHK4XED · pith_short_16: WXNMCRHK4XEDUBDF · pith_short_8: WXNMCRHK

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/WXNMCRHK4XEDUBDFWPWHTSHF7P \
  | 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: b5dac144eae5c83a0465b3ec79c8e5fbe624329ec0ab0008a0cef078857043df

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "aca58a5b3833d2f6c85f216b293f2e68211e5546545a42d9c17a6e429b80424f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2009-08-24T09:24:21Z",
    "title_canon_sha256": "cde0bdf6fc62f9f86a34e72e93f5e65fe7dfc76b15eb9baf78add3c447cf4b3b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.3393",
    "kind": "arxiv",
    "version": 1
  }
}