Pith Number

pith:26MBY2W3

pith:2009:26MBY2W3XK5LUW77UEZVAUOGVD

not attested not anchored not stored refs pending

On the Complexity of Deciding Call-by-Need

Aart Middeldorp, Ir\`ene Durand (LaBRI)

arxiv:0901.0869 v2 · 2009-01-07 · 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{26MBY2W3XK5LUW77UEZVAUOGVD}

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	2026-05-18T04:07:40.969587Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d7981c6adbbababa5bffa1335051c6a8e062892f4223c65c78ae9c39cfebe8d1

Aliases

arxiv: 0901.0869 · arxiv_version: 0901.0869v2 · doi: 10.48550/arxiv.0901.0869 · pith_short_12: 26MBY2W3XK5L · pith_short_16: 26MBY2W3XK5LUW77 · pith_short_8: 26MBY2W3

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/26MBY2W3XK5LUW77UEZVAUOGVD \
  | 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: d7981c6adbbababa5bffa1335051c6a8e062892f4223c65c78ae9c39cfebe8d1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "35db753e3d2a37f53b73bd182c4ddfad9fcf9c9f6ff32bdc5f1a264f306c7285",
    "cross_cats_sorted": [
      "cs.PL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2009-01-07T20:17:25Z",
    "title_canon_sha256": "d87bc0a4bc904cec07abb6cd00b21036b81eb47dbf80693fc5386d0b2de07e30"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.0869",
    "kind": "arxiv",
    "version": 2
  }
}