Pith Number

pith:5EWKUTIK

pith:2008:5EWKUTIK4G4VUYNWAGXPWIWB3E

not attested not anchored not stored refs pending

Sparse Approximate Solution of Partial Differential Equations

Harry Yserentant, Marc Pfetsch, Sadegh Jokar, Volker Mehrmann

arxiv:0804.0864 v2 · 2008-04-05 · math.NA · cs.NA · math.AP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5EWKUTIK4G4VUYNWAGXPWIWB3E}

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	2026-06-03T22:06:05.389803Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e92caa4d0ae1b95a61b601aefb22c1d930cad2234284e4d48a9ba0239ad4bb26

Aliases

arxiv: 0804.0864 · arxiv_version: 0804.0864v2 · doi: 10.48550/arxiv.0804.0864 · pith_short_12: 5EWKUTIK4G4V · pith_short_16: 5EWKUTIK4G4VUYNW · pith_short_8: 5EWKUTIK

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/5EWKUTIK4G4VUYNWAGXPWIWB3E \
  | 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: e92caa4d0ae1b95a61b601aefb22c1d930cad2234284e4d48a9ba0239ad4bb26

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6221b3829c8468f14ca5e9bf734fdee1dc884ebcc4de9280f503975b40b2e2aa",
    "cross_cats_sorted": [
      "cs.NA",
      "math.AP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2008-04-05T18:37:18Z",
    "title_canon_sha256": "a35cdc028dd52c9375fb9e09e64b3608c2d430ddeb8d6ca07ef4fe5c5ec794fb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0804.0864",
    "kind": "arxiv",
    "version": 2
  }
}