Pith Number

pith:YA4DLAGW

pith:2006:YA4DLAGWKCJI7E35E3RWRWJFAB

not attested not anchored not stored refs pending

A counterexample concerning the L_2-projector onto linear spline spaces

Peter Oswald

arxiv:math/0611573 v1 · 2006-11-19 · 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{YA4DLAGWKCJI7E35E3RWRWJFAB}

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	2026-06-03T22:06:21.343662Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c0383580d650928f937d26e368d925005a085bee49f338f7d13868bef02080ec

Aliases

arxiv: math/0611573 · arxiv_version: math/0611573v1 · doi: 10.48550/arxiv.math/0611573 · pith_short_12: YA4DLAGWKCJI · pith_short_16: YA4DLAGWKCJI7E35 · pith_short_8: YA4DLAGW

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/YA4DLAGWKCJI7E35E3RWRWJFAB \
  | 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: c0383580d650928f937d26e368d925005a085bee49f338f7d13868bef02080ec

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b00062034d21554a322e6d5020f278ed14cbcd2e75c42a78426b661a5560693e",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "",
    "primary_cat": "math.NA",
    "submitted_at": "2006-11-19T16:18:08Z",
    "title_canon_sha256": "d7187af26eb245dd6889eff2d1b52abcbc754205a24d58f65e3aa08d4f7210f1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0611573",
    "kind": "arxiv",
    "version": 1
  }
}