Pith Number

pith:SQPPU3DC

pith:2010:SQPPU3DCJBGK3L674OQOD2ZOAG

not attested not anchored not stored refs pending

A characterization of the extrinsic spheres in a Riemannian manifold

Ognian Kassabov

arxiv:1010.2863 v1 · 2010-10-14 · math.DG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SQPPU3DCJBGK3L674OQOD2ZOAG}

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	2026-05-18T04:39:18.983923Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

941efa6c62484cadafdfe3a0e1eb2e018d1cce4ac80d09c194ee0fb84a66d406

Aliases

arxiv: 1010.2863 · arxiv_version: 1010.2863v1 · doi: 10.48550/arxiv.1010.2863 · pith_short_12: SQPPU3DCJBGK · pith_short_16: SQPPU3DCJBGK3L67 · pith_short_8: SQPPU3DC

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/SQPPU3DCJBGK3L674OQOD2ZOAG \
  | 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: 941efa6c62484cadafdfe3a0e1eb2e018d1cce4ac80d09c194ee0fb84a66d406

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "74bb699ab85323af788b3f78251c1040ce97185274755e26dafa4e8fbf5f316d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2010-10-14T09:29:02Z",
    "title_canon_sha256": "b1ac32ac34d837fa43879b0f870eebf39ea72fbc3ace182332cfc71df8b68759"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1010.2863",
    "kind": "arxiv",
    "version": 1
  }
}