Pith Number

pith:PJAMWNJS

pith:2009:PJAMWNJSV3IXGUVUW5Q4KFUVN4

not attested not anchored not stored refs pending

The cohomological restriction map and FP-infinity groups

Ehud Meir

arxiv:0911.3267 v2 · 2009-11-17 · math.KT · math.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PJAMWNJSV3IXGUVUW5Q4KFUVN4}

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	2026-05-18T02:58:02.628927Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7a40cb3532aed17352b4b761c516956f229997f9629402a0184d27ddbb01c136

Aliases

arxiv: 0911.3267 · arxiv_version: 0911.3267v2 · doi: 10.48550/arxiv.0911.3267 · pith_short_12: PJAMWNJSV3IX · pith_short_16: PJAMWNJSV3IXGUVU · pith_short_8: PJAMWNJS

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/PJAMWNJSV3IXGUVUW5Q4KFUVN4 \
  | 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: 7a40cb3532aed17352b4b761c516956f229997f9629402a0184d27ddbb01c136

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d8568ea65e2b20be46222643baae0a55a2a31eaf836041c7fe799c66ba8e8f31",
    "cross_cats_sorted": [
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.KT",
    "submitted_at": "2009-11-17T11:14:07Z",
    "title_canon_sha256": "0892dd003ec45c445b460a57787a21241acd166e8aeacd207dc172fb52fb2a62"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0911.3267",
    "kind": "arxiv",
    "version": 2
  }
}