Pith Number

pith:J56GN5SP

pith:2008:J56GN5SPTZULG66UTEO2PD7FPS

not attested not anchored not stored refs pending

On the nontrivial projection problem

Nicole Tomczak-Jaegermann, Stanislaw J. Szarek

arxiv:0805.3792 v1 · 2008-05-24 · math.FA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{J56GN5SPTZULG66UTEO2PD7FPS}

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	2026-05-18T04:41:05.348192Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4f7c66f64f9e68b37bd4991da78fe57c9972d8de378787d81fc762742796afdf

Aliases

arxiv: 0805.3792 · arxiv_version: 0805.3792v1 · doi: 10.48550/arxiv.0805.3792 · pith_short_12: J56GN5SPTZUL · pith_short_16: J56GN5SPTZULG66U · pith_short_8: J56GN5SP

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/J56GN5SPTZULG66UTEO2PD7FPS \
  | 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: 4f7c66f64f9e68b37bd4991da78fe57c9972d8de378787d81fc762742796afdf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "19dd6000c2ff3a44e766aa7b931071f1e054b9c1cb732d1ff6543ea9733b0a3b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.FA",
    "submitted_at": "2008-05-24T20:42:59Z",
    "title_canon_sha256": "acf90c1fa3f534a20eff5512ec105dc578ed4bf21893628ff56d016706f56b2a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0805.3792",
    "kind": "arxiv",
    "version": 1
  }
}