Pith Number

pith:4EB456KN

pith:1995:4EB456KNF5RNXDFFLUYBV6FODK

not attested not anchored not stored refs pending

On singularities of ${\cal M}_{I\!\! P^3}(c_1,c_2)$

Giorgio Ottaviani, Vincenzo Ancona

arxiv:alg-geom/9502008 v1 · 1995-02-13 · 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{4EB456KNF5RNXDFFLUYBV6FODK}

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	2026-05-18T01:37:42.993451Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e103cef94d2f62db8ca55d301af8ae1a84920558161e500661bad331745cd2ab

Aliases

arxiv: alg-geom/9502008 · arxiv_version: alg-geom/9502008v1 · doi: 10.48550/arxiv.alg-geom/9502008 · pith_short_12: 4EB456KNF5RN · pith_short_16: 4EB456KNF5RNXDFF · pith_short_8: 4EB456KN

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/4EB456KNF5RNXDFFLUYBV6FODK \
  | 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: e103cef94d2f62db8ca55d301af8ae1a84920558161e500661bad331745cd2ab

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ca385f5ca740436629e8e77c6422a3db6f02005067725da4927c2cc440b7f8d",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "",
    "primary_cat": "alg-geom",
    "submitted_at": "1995-02-13T17:18:43Z",
    "title_canon_sha256": "e4e98ffa9ed0ad22fbd0ecd0987dc9f0148ef33a6020f0080b820b7bc9dd435e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "alg-geom/9502008",
    "kind": "arxiv",
    "version": 1
  }
}