Pith Number

pith:SQS2C6CA

pith:2014:SQS2C6CAWBM5W2I5SOSUSX5EWT

not attested not anchored not stored refs pending

Best Polynomial Approximation on the Unit Sphere and the Unit Ball

Yuan Xu

arxiv:1402.5671 v1 · 2014-02-23 · math.CA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SQS2C6CAWBM5W2I5SOSUSX5EWT}

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	2026-05-18T02:58:14.062229Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9425a17840b059db691d93a5495fa4b4f17ae25d143aaa1d814ee6b19ba22bc2

Aliases

arxiv: 1402.5671 · arxiv_version: 1402.5671v1 · doi: 10.48550/arxiv.1402.5671 · pith_short_12: SQS2C6CAWBM5 · pith_short_16: SQS2C6CAWBM5W2I5 · pith_short_8: SQS2C6CA

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/SQS2C6CAWBM5W2I5SOSUSX5EWT \
  | 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: 9425a17840b059db691d93a5495fa4b4f17ae25d143aaa1d814ee6b19ba22bc2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c4434daf84911367262479da84a169f4b13dfcc64c814763889f208da7d8e2c1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CA",
    "submitted_at": "2014-02-23T20:47:45Z",
    "title_canon_sha256": "4bea46e3512f3cde6ae451a52b889b754f8c10dae8232e4e2373b646f713c8aa"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1402.5671",
    "kind": "arxiv",
    "version": 1
  }
}