Pith Number

pith:ST7T7BYU

pith:2013:ST7T7BYUG53ZARX5UPATQDZJ43

not attested not anchored not stored refs pending

Basic Classes of Grammars with Prohibition

Mark Burgin

arxiv:1302.5181 v1 · 2013-02-21 · cs.FL · cs.CL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ST7T7BYUG53ZARX5UPATQDZJ43}

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	2026-05-18T03:32:59.361380Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

94ff3f871437779046fda3c1380f29e6e7aeaa27d15663964a6547f84369fda8

Aliases

arxiv: 1302.5181 · arxiv_version: 1302.5181v1 · doi: 10.48550/arxiv.1302.5181 · pith_short_12: ST7T7BYUG53Z · pith_short_16: ST7T7BYUG53ZARX5 · pith_short_8: ST7T7BYU

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/ST7T7BYUG53ZARX5UPATQDZJ43 \
  | 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: 94ff3f871437779046fda3c1380f29e6e7aeaa27d15663964a6547f84369fda8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f388f1bac0373114a44b5c129a0a50209b1ccb3f572b278d6a9bf246e9685a7a",
    "cross_cats_sorted": [
      "cs.CL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2013-02-21T04:58:48Z",
    "title_canon_sha256": "7bfff02ff790d809a5406538587a67c857489c6ee46353c19cee398f61c55a16"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1302.5181",
    "kind": "arxiv",
    "version": 1
  }
}