Pith Number

pith:ENLZ2SRN

pith:2014:ENLZ2SRNBDUSEZQRMYFZ5KIF5S

not attested not anchored not stored refs pending

Local initial segments of the Turing degrees

Bj{\o}rn Kjos-Hanssen

arxiv:1408.3158 v2 · 2014-08-13 · 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{ENLZ2SRNBDUSEZQRMYFZ5KIF5S}

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	2026-05-18T01:11:57.946809Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

23579d4a2d08e9226611660b9ea905eca3286ab0a3f9afdd2f825fd2e723bbe9

Aliases

arxiv: 1408.3158 · arxiv_version: 1408.3158v2 · doi: 10.48550/arxiv.1408.3158 · pith_short_12: ENLZ2SRNBDUS · pith_short_16: ENLZ2SRNBDUSEZQR · pith_short_8: ENLZ2SRN

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/ENLZ2SRNBDUSEZQRMYFZ5KIF5S \
  | 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: 23579d4a2d08e9226611660b9ea905eca3286ab0a3f9afdd2f825fd2e723bbe9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "678183631fa9c9a51e3614c0bb72c068d056b88ab5d6d35cd6839f80908f8a52",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2014-08-13T22:38:33Z",
    "title_canon_sha256": "853b5e95e988f44e75d62539e1f407a0485bdaadfe741302bb4f720a23f008af"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1408.3158",
    "kind": "arxiv",
    "version": 2
  }
}