Pith Number

pith:CF7VJ5L6

pith:2009:CF7VJ5L6SCWAH6OWVPIUWKW4XZ

not attested not anchored not stored refs pending

Strong cohomological rigidity of a product of projective spaces

Dong Youp Suh, Suyoung Choi

arxiv:0912.4791 v1 · 2009-12-24 · 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{CF7VJ5L6SCWAH6OWVPIUWKW4XZ}

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	2026-05-18T03:45:21.442989Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

117f54f57e90ac03f9d6abd14b2adcbe630208e42b6b1885b15e4429e032c504

Aliases

arxiv: 0912.4791 · arxiv_version: 0912.4791v1 · doi: 10.48550/arxiv.0912.4791 · pith_short_12: CF7VJ5L6SCWA · pith_short_16: CF7VJ5L6SCWAH6OW · pith_short_8: CF7VJ5L6

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/CF7VJ5L6SCWAH6OWVPIUWKW4XZ \
  | 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: 117f54f57e90ac03f9d6abd14b2adcbe630208e42b6b1885b15e4429e032c504

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "58fbd92297bcf665f5b5188be9f4b84194ffb6a426e319a5248ebd714a90cae1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2009-12-24T05:29:10Z",
    "title_canon_sha256": "4d76ed5b995ecbbed50898bfeefdf8239b9b3cc38d5bcd98599cb106f5966b69"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.4791",
    "kind": "arxiv",
    "version": 1
  }
}