Pith Number

pith:J32VWQ6H

pith:2015:J32VWQ6HR4PHD6BZDC4R667ZJS

not attested not anchored not stored refs pending

Natural Deduction for the Sheffer Stroke and Peirce's Arrow (And Any Other Truth-Functional Connective)

Richard Zach

arxiv:1504.05995 v2 · 2015-04-22 · 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{J32VWQ6HR4PHD6BZDC4R667ZJS}

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	2026-05-18T00:31:59.684598Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4ef55b43c78f1e71f83918b91f7bf94ca1b8a2a7fd74cd8b450b08ee6ba29aa5

Aliases

arxiv: 1504.05995 · arxiv_version: 1504.05995v2 · doi: 10.48550/arxiv.1504.05995 · pith_short_12: J32VWQ6HR4PH · pith_short_16: J32VWQ6HR4PHD6BZ · pith_short_8: J32VWQ6H

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/J32VWQ6HR4PHD6BZDC4R667ZJS \
  | 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: 4ef55b43c78f1e71f83918b91f7bf94ca1b8a2a7fd74cd8b450b08ee6ba29aa5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "56f3174cb465afa443e3ed1bb528968711ef8ee6308504dedd529a9623e6dc06",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2015-04-22T21:58:45Z",
    "title_canon_sha256": "b07d31e39a94ee89821b36df5286fd38792bc0864c5f9b849302f26f48784857"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.05995",
    "kind": "arxiv",
    "version": 2
  }
}