Pith Number

pith:IMXX6DP3

pith:2016:IMXX6DP3SMJCFMS2XVUF6ZANHH

not attested not anchored not stored refs pending

Order-Invariance of Two-Variable Logic is Decidable

Frederik Harwath, Thomas Zeume

arxiv:1604.05843 v1 · 2016-04-20 · 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{IMXX6DP3SMJCFMS2XVUF6ZANHH}

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	2026-05-18T01:16:35.329862Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

432f7f0dfb931222b25abd685f640d39c360b83c5d89ca4b2b337a678b2e4d4b

Aliases

arxiv: 1604.05843 · arxiv_version: 1604.05843v1 · doi: 10.48550/arxiv.1604.05843 · pith_short_12: IMXX6DP3SMJC · pith_short_16: IMXX6DP3SMJCFMS2 · pith_short_8: IMXX6DP3

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/IMXX6DP3SMJCFMS2XVUF6ZANHH \
  | 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: 432f7f0dfb931222b25abd685f640d39c360b83c5d89ca4b2b337a678b2e4d4b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "12b8a682e654576bcbd4cee811eb0619ded586afe75c43af4ff6050822755de5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2016-04-20T06:53:18Z",
    "title_canon_sha256": "cc6bb72d0e8416de9c9fbcf8ce6b0b9e59c5c4b305048d01cfcc35133087b8d9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1604.05843",
    "kind": "arxiv",
    "version": 1
  }
}