Pith Number

pith:743MQKQ5

pith:2016:743MQKQ5AW4XTRVLTZBWT7HEEE

not attested not anchored not stored refs pending

The Prehistory of the Subsystems of Second-Order Arithmetic

Sean Walsh, Walter Dean

arxiv:1612.06219 v1 · 2016-12-19 · math.HO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{743MQKQ5AW4XTRVLTZBWT7HEEE}

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	2026-05-18T00:54:42.883851Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ff36c82a1d05b979c6ab9e4369fce421151d412f5e82816109ede9707081252f

Aliases

arxiv: 1612.06219 · arxiv_version: 1612.06219v1 · doi: 10.48550/arxiv.1612.06219 · pith_short_12: 743MQKQ5AW4X · pith_short_16: 743MQKQ5AW4XTRVL · pith_short_8: 743MQKQ5

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/743MQKQ5AW4XTRVLTZBWT7HEEE \
  | 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: ff36c82a1d05b979c6ab9e4369fce421151d412f5e82816109ede9707081252f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f8e19784162cd934d36f69cf3360ce271b476042d5511117825f68d4f628cb8b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2016-12-19T15:13:01Z",
    "title_canon_sha256": "a553a9faca9ba5fd37c5de1507201b07fdb372563ef13ad9f9755cc9346ae0ff"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1612.06219",
    "kind": "arxiv",
    "version": 1
  }
}