Pith Number

pith:XGX3TV4B

pith:1995:XGX3TV4BWVQJSMCTCXDRP7UYUM

not attested not anchored not stored refs pending

On the Obstructions to non-Cliffordian Pin Structures

Andrew Chamblin (DAMTP, Cambridge)

arxiv:gr-qc/9509039 v1 · 1995-09-22 · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XGX3TV4BWVQJSMCTCXDRP7UYUM}

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	2026-05-18T01:39:19.520367Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b9afb9d781b56099305315c717fe98a31fcd6256c9d459877a1b1c900963a3b4

Aliases

arxiv: gr-qc/9509039 · arxiv_version: gr-qc/9509039v1 · doi: 10.48550/arxiv.gr-qc/9509039 · pith_short_12: XGX3TV4BWVQJ · pith_short_16: XGX3TV4BWVQJSMCT · pith_short_8: XGX3TV4B

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/XGX3TV4BWVQJSMCTCXDRP7UYUM \
  | 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: b9afb9d781b56099305315c717fe98a31fcd6256c9d459877a1b1c900963a3b4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "873cd59c06bb1a7c38e034edee5adc4b31df0bd65911130185720abe774fdb52",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "gr-qc",
    "submitted_at": "1995-09-22T02:53:18Z",
    "title_canon_sha256": "9035bbe03e51506bbe1a9e0f591eb4c2cefa2aec2a29c7ca893f4995abf69ee2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "gr-qc/9509039",
    "kind": "arxiv",
    "version": 1
  }
}