Pith Number

pith:W7ZNZX77

pith:2009:W7ZNZX77XOANPXK2BRC262FQTG

not attested not anchored not stored refs pending

Derivation of an upper bound of the constant in the error bound for a near best m-term approximation

Evgeny Spodarev, Hans-Peter Scheffler, Wolfgang Karcher

arxiv:0910.1202 v1 · 2009-10-07 · math.NA · cs.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W7ZNZX77XOANPXK2BRC262FQTG}

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	2026-06-03T23:06:29.631234Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b7f2dcdfffbb80d7dd5a0c45af68b099815a33a2951d330cb4c6f60d51703daf

Aliases

arxiv: 0910.1202 · arxiv_version: 0910.1202v1 · doi: 10.48550/arxiv.0910.1202 · pith_short_12: W7ZNZX77XOAN · pith_short_16: W7ZNZX77XOANPXK2 · pith_short_8: W7ZNZX77

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/W7ZNZX77XOANPXK2BRC262FQTG \
  | 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: b7f2dcdfffbb80d7dd5a0c45af68b099815a33a2951d330cb4c6f60d51703daf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "24d5d389527a82828e73d1426b7d66f76a9dd9a05d49dd24b623ae4015d53cae",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2009-10-07T09:54:14Z",
    "title_canon_sha256": "7f4586770390064cf7199f3a5b15776b66bedc59233f3951caf0b83654337098"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0910.1202",
    "kind": "arxiv",
    "version": 1
  }
}