Pith Number

pith:EWDLLFG5

pith:2018:EWDLLFG5Q7HISATE5QAUVVZQD5

not attested not anchored not stored refs pending

Surreal Birthdays and Their Arithmetic

Matthew Roughan

arxiv:1810.10373 v2 · 2018-10-23 · 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{EWDLLFG5Q7HISATE5QAUVVZQD5}

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	2026-05-18T00:02:20.195295Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2586b594dd87ce890264ec014ad7301f4f1b1a1b184fd0538e3a36be4be5f292

Aliases

arxiv: 1810.10373 · arxiv_version: 1810.10373v2 · doi: 10.48550/arxiv.1810.10373 · pith_short_12: EWDLLFG5Q7HI · pith_short_16: EWDLLFG5Q7HISATE · pith_short_8: EWDLLFG5

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/EWDLLFG5Q7HISATE5QAUVVZQD5 \
  | 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: 2586b594dd87ce890264ec014ad7301f4f1b1a1b184fd0538e3a36be4be5f292

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "38188a2b00974808ebe95125261cd14cc15c7b6b6e72da8fdb4a576faa26f5ca",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2018-10-23T05:56:19Z",
    "title_canon_sha256": "e6e01a1e64873a22e4635aa2fc5db35e8a8f7d86a4c7614469f9f66add36bf6b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.10373",
    "kind": "arxiv",
    "version": 2
  }
}