Pith Number

pith:DUHM7CY6

pith:2017:DUHM7CY6IDE5WR3FB2FSNGQCVU

not attested not anchored not stored refs pending

A Computational Interpretation of Context-Free Expressions

Martin Sulzmann, Peter Thiemann

arxiv:1708.07366 v1 · 2017-08-24 · cs.FL · cs.LO · cs.PL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DUHM7CY6IDE5WR3FB2FSNGQCVU}

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	2026-05-18T00:36:44.540851Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1d0ecf8b1e40c9db47650e8b269a02ad29d0a6a88655923034643d98644a082c

Aliases

arxiv: 1708.07366 · arxiv_version: 1708.07366v1 · doi: 10.48550/arxiv.1708.07366 · pith_short_12: DUHM7CY6IDE5 · pith_short_16: DUHM7CY6IDE5WR3F · pith_short_8: DUHM7CY6

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/DUHM7CY6IDE5WR3FB2FSNGQCVU \
  | 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: 1d0ecf8b1e40c9db47650e8b269a02ad29d0a6a88655923034643d98644a082c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3b6aa1a275a642bd8affae4c89fcb9e4a5c7392d5b0c691cd56438637d7dd76b",
    "cross_cats_sorted": [
      "cs.LO",
      "cs.PL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2017-08-24T12:02:28Z",
    "title_canon_sha256": "da98c781eac4b18215334c4bc4af8db7128b8d1e4a6244de95f755af560f6db4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1708.07366",
    "kind": "arxiv",
    "version": 1
  }
}