Pith Number

pith:CGVCM5VT

pith:2018:CGVCM5VTRXKCI3T6ADEKRKZYUZ

not attested not anchored not stored refs pending

On motivic obstructions to Witt cancellation for quadratic forms over schemes

Matthias Wendt

arxiv:1810.04228 v1 · 2018-10-09 · math.AG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CGVCM5VTRXKCI3T6ADEKRKZYUZ}

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	2026-05-18T00:03:40.765157Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

11aa2676b38dd4246e7e00c8a8ab38a660f803d12bd89bc5e62be5c9267d9ad6

Aliases

arxiv: 1810.04228 · arxiv_version: 1810.04228v1 · doi: 10.48550/arxiv.1810.04228 · pith_short_12: CGVCM5VTRXKC · pith_short_16: CGVCM5VTRXKCI3T6 · pith_short_8: CGVCM5VT

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/CGVCM5VTRXKCI3T6ADEKRKZYUZ \
  | 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: 11aa2676b38dd4246e7e00c8a8ab38a660f803d12bd89bc5e62be5c9267d9ad6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "19670f0b395061958a2b2f76b7c3e75292c5e0279b05505bb4078474b467cd2a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2018-10-09T20:14:13Z",
    "title_canon_sha256": "95c731684918b8ed178f838ab3cc12ca03feee3db93928fa423c4e9f592e7aa8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.04228",
    "kind": "arxiv",
    "version": 1
  }
}