Pith Number

pith:XSCUFEN6

pith:1995:XSCUFEN6ZGUPCLE54ALPXQVHRT

not attested not anchored not stored refs pending

Delta-1-2 Without Sharps

Sy D. Friedman, W. Hugh Woodin

arxiv:math/9509209 v1 · 1995-09-01 · math.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{XSCUFEN6ZGUPCLE54ALPXQVHRT}

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	2026-05-18T01:05:48.353927Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bc854291bec9a8f12c9de016fbc2a78cf398885034c336a4145405531582749f

Aliases

arxiv: math/9509209 · arxiv_version: math/9509209v1 · doi: 10.48550/arxiv.math/9509209 · pith_short_12: XSCUFEN6ZGUP · pith_short_16: XSCUFEN6ZGUPCLE5 · pith_short_8: XSCUFEN6

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/XSCUFEN6ZGUPCLE54ALPXQVHRT \
  | 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: bc854291bec9a8f12c9de016fbc2a78cf398885034c336a4145405531582749f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "53af4603a1ccfa303553d50375a1855fd6ecaeeca98408976264cc6826d595a0",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.LO",
    "submitted_at": "1995-09-01T00:00:00Z",
    "title_canon_sha256": "f5b7e5d2095487f9aebd39b99cd87d064fd9eb931bb691442dc3d1459f2fc13c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/9509209",
    "kind": "arxiv",
    "version": 1
  }
}