Pith Number

pith:XJCQLXPI

pith:2015:XJCQLXPIHKHZQX3KSY3QQTTQOW

not attested not anchored not stored refs pending

The logic of the reverse mathematics zoo

Alberto Marcone, Giovanna D'Agostino

arxiv:1512.08035 v1 · 2015-12-25 · 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{XJCQLXPIHKHZQX3KSY3QQTTQOW}

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	2026-05-17T23:59:03.968720Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ba4505dde83a8f985f6a9637084e707590f3f1050dc6896ef0619672d500ee8b

Aliases

arxiv: 1512.08035 · arxiv_version: 1512.08035v1 · doi: 10.48550/arxiv.1512.08035 · pith_short_12: XJCQLXPIHKHZ · pith_short_16: XJCQLXPIHKHZQX3K · pith_short_8: XJCQLXPI

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/XJCQLXPIHKHZQX3KSY3QQTTQOW \
  | 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: ba4505dde83a8f985f6a9637084e707590f3f1050dc6896ef0619672d500ee8b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "861ba4b785c164bfbf5b6e5dd6a538974df0625bbfbb4e6391972796148c8cf2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2015-12-25T21:15:12Z",
    "title_canon_sha256": "55d8a22dab3c84799f44141d579c0e9d6991d950e56589226093f1dc6b210a35"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1512.08035",
    "kind": "arxiv",
    "version": 1
  }
}