Pith Number

pith:HUN52QMM

pith:2009:HUN52QMMJOONYQJ3HKGI4AQ5CM

not attested not anchored not stored refs pending

Weihrauch Degrees, Omniscience Principles and Weak Computability

Guido Gherardi, Vasco Brattka

arxiv:0905.4679 v2 · 2009-05-28 · math.LO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HUN52QMMJOONYQJ3HKGI4AQ5CM}

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	2026-05-18T04:32:00.807806Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3d1bdd418c4b9cdc413b3a8c8e021d1308db0c5235cba6d8fda2fa59b382a137

Aliases

arxiv: 0905.4679 · arxiv_version: 0905.4679v2 · doi: 10.48550/arxiv.0905.4679 · pith_short_12: HUN52QMMJOON · pith_short_16: HUN52QMMJOONYQJ3 · pith_short_8: HUN52QMM

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/HUN52QMMJOONYQJ3HKGI4AQ5CM \
  | 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: 3d1bdd418c4b9cdc413b3a8c8e021d1308db0c5235cba6d8fda2fa59b382a137

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4b1eb8ea92be16093a6ec1f66fe141fd238d77b9db12df05a13af8193baf78d9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2009-05-28T15:33:23Z",
    "title_canon_sha256": "aefb54f6888b1dc2fccc025a2c11b2da06f62ad2d829f6b01896846d11a8d88a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.4679",
    "kind": "arxiv",
    "version": 2
  }
}