Pith Number

pith:IOR27VNN

pith:1996:IOR27VNNSSY5ZQQE3YNXUOIWQF

not attested not anchored not stored refs pending

On Cohomology of the Square of an Ideal Sheaf

Jonathan Wahl

arxiv:alg-geom/9601027 v2 · 1996-01-29 · alg-geom · math.AG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IOR27VNNSSY5ZQQE3YNXUOIWQF}

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	2026-05-18T01:37:42.842689Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

43a3afd5ad94b1dcc204de1b7a39168172c500adf351425540bdbf4db7717ad1

Aliases

arxiv: alg-geom/9601027 · arxiv_version: alg-geom/9601027v2 · doi: 10.48550/arxiv.alg-geom/9601027 · pith_short_12: IOR27VNNSSY5 · pith_short_16: IOR27VNNSSY5ZQQE · pith_short_8: IOR27VNN

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/IOR27VNNSSY5ZQQE3YNXUOIWQF \
  | 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: 43a3afd5ad94b1dcc204de1b7a39168172c500adf351425540bdbf4db7717ad1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a6560009057180072e6b96c0ba3caf26891b74dfcc85029ddc793acfa0d6ef67",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "",
    "primary_cat": "alg-geom",
    "submitted_at": "1996-01-29T16:26:13Z",
    "title_canon_sha256": "3d1577b3ecabb734b64e8c4aba81d50b3455eff61fea1bbf1fa7e3d99fc2cacc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "alg-geom/9601027",
    "kind": "arxiv",
    "version": 2
  }
}