Pith Number

pith:WGLAVJST

pith:2018:WGLAVJSTFLTMKN2N4Q73BUQOAL

not attested not anchored not stored refs pending

The reverse mathematics of Hindman's theorem for sums of exactly two elements

Barbara F. Csima, Carl G. Jockusch, Damir D. Dzhafarov, Denis R. Hirschfeldt, Jr., Linda Brown Westrick, Reed Solomon

arxiv:1804.09809 v3 · 2018-04-25 · 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{WGLAVJSTFLTMKN2N4Q73BUQOAL}

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	2026-05-18T00:14:44.018212Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b1960aa6532ae6c5374de43fb0d20e02c2b706e458094d0e03e7acf4a4bc0f82

Aliases

arxiv: 1804.09809 · arxiv_version: 1804.09809v3 · doi: 10.48550/arxiv.1804.09809 · pith_short_12: WGLAVJSTFLTM · pith_short_16: WGLAVJSTFLTMKN2N · pith_short_8: WGLAVJST

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/WGLAVJSTFLTMKN2N4Q73BUQOAL \
  | 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: b1960aa6532ae6c5374de43fb0d20e02c2b706e458094d0e03e7acf4a4bc0f82

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "25dd9d39d3240d65877e824044eb156cedbbf8714111fc6af4f2fc73e725a633",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2018-04-25T21:40:25Z",
    "title_canon_sha256": "f267d769e3ab0b89fcabfc6cfd72f0e8b97333aeb982fbcdd892d9ac2ccbd4cd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.09809",
    "kind": "arxiv",
    "version": 3
  }
}