Pith Number

pith:7377T4RF

pith:2007:7377T4RFWJD6WXWNGIMTXR3MDR

not attested not anchored not stored refs pending

Tangential projections and secant defective varieties

Jose Carlos Sierra, Luis Eduardo Sola Conde, Roberto Munoz

arxiv:0707.1429 v1 · 2007-07-10 · 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{7377T4RFWJD6WXWNGIMTXR3MDR}

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	2026-05-18T02:47:13.461500Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fefff9f225b247eb5ecd32193bc76c1c5aa14294e4470e50955b51cbffe33ee7

Aliases

arxiv: 0707.1429 · arxiv_version: 0707.1429v1 · doi: 10.48550/arxiv.0707.1429 · pith_short_12: 7377T4RFWJD6 · pith_short_16: 7377T4RFWJD6WXWN · pith_short_8: 7377T4RF

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/7377T4RFWJD6WXWNGIMTXR3MDR \
  | 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: fefff9f225b247eb5ecd32193bc76c1c5aa14294e4470e50955b51cbffe33ee7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "eb4f44a634b51e1ad93f5280d2e161afbd27a4912802c5bf6c9cc9e173bace6c",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.AG",
    "submitted_at": "2007-07-10T12:47:05Z",
    "title_canon_sha256": "20f220f76b845e2fc027c0ea0c57416f7233587d7c097d9e0ddbef769603eb4a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0707.1429",
    "kind": "arxiv",
    "version": 1
  }
}