Pith Number

pith:TOCS4V4U

pith:2019:TOCS4V4UA7MARZAFTFO5MZ2HI2

not attested not anchored not stored refs pending

(Seemingly) Impossible Theorems in Constructive Mathematics

Hannes Diener, Matthew Hendtlass

arxiv:1904.11378 v1 · 2019-04-12 · math.LO · cs.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{TOCS4V4UA7MARZAFTFO5MZ2HI2}

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	2026-05-17T23:47:45.064606Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9b852e579407d808e405995dd6674746b078e44ead5957b96bdff720a95cb20d

Aliases

arxiv: 1904.11378 · arxiv_version: 1904.11378v1 · doi: 10.48550/arxiv.1904.11378 · pith_short_12: TOCS4V4UA7MA · pith_short_16: TOCS4V4UA7MARZAF · pith_short_8: TOCS4V4U

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/TOCS4V4UA7MARZAFTFO5MZ2HI2 \
  | 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: 9b852e579407d808e405995dd6674746b078e44ead5957b96bdff720a95cb20d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "76553867eeff6964a9c9dce7c30e939220573901eb3bc06051abb064834fa181",
    "cross_cats_sorted": [
      "cs.LO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2019-04-12T02:33:28Z",
    "title_canon_sha256": "e5148f27f6b3921eb0a7e98adf973adb90f782ef2b6711595f1d0799f779c450"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.11378",
    "kind": "arxiv",
    "version": 1
  }
}