Pith Number

pith:F5MFSEBB

pith:2026:F5MFSEBB7ZQRHWIBDHME2NZ2WB

not attested not anchored not stored refs pending

Non-computability of $K$-theory for computably presented C*-algebras

Christopher J. Eagle, Isaac Goldbring, Russell Miller, Timothy H. McNicholl

arxiv:2602.06877 v3 · 2026-02-06 · math.OA · 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{F5MFSEBB7ZQRHWIBDHME2NZ2WB}

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.

Cited by

1 paper in Pith

The computable functional calculus

Receipt and verification

First computed	2026-06-19T16:10:54.637950Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2f58591021fe6113d90119d84d373ab077e89d8ed6568f2d9ef21db130613ad5

Aliases

arxiv: 2602.06877 · arxiv_version: 2602.06877v3 · doi: 10.48550/arxiv.2602.06877 · pith_short_12: F5MFSEBB7ZQR · pith_short_16: F5MFSEBB7ZQRHWIB · pith_short_8: F5MFSEBB

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/F5MFSEBB7ZQRHWIBDHME2NZ2WB \
  | 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: 2f58591021fe6113d90119d84d373ab077e89d8ed6568f2d9ef21db130613ad5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2329f4fbe27a2639eae7b181f0bdf06d3ebe1d273b21f2e96cbe376178d4735b",
    "cross_cats_sorted": [
      "math.LO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "math.OA",
    "submitted_at": "2026-02-06T17:02:56Z",
    "title_canon_sha256": "2d3bc56d6e18fe5f42c290393747155f45178c5cdffe22aa9312709466c56dd2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2602.06877",
    "kind": "arxiv",
    "version": 3
  }
}