Pith Number

pith:SQPHA6WB

pith:2012:SQPHA6WBQAGPYMSK5QZQUCH7UT

not attested not anchored not stored refs pending

$BP$: Close encounters of the $E_\infty$ kind

Andrew Baker

arxiv:1204.4878 v6 · 2012-04-22 · math.AT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SQPHA6WBQAGPYMSK5QZQUCH7UT}

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	2026-05-18T03:17:25.033204Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

941e707ac1800cfc324aec330a08ffa4c6648bf1769b8fbdfab2d5934b0060a3

Aliases

arxiv: 1204.4878 · arxiv_version: 1204.4878v6 · doi: 10.48550/arxiv.1204.4878 · pith_short_12: SQPHA6WBQAGP · pith_short_16: SQPHA6WBQAGPYMSK · pith_short_8: SQPHA6WB

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/SQPHA6WBQAGPYMSK5QZQUCH7UT \
  | 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: 941e707ac1800cfc324aec330a08ffa4c6648bf1769b8fbdfab2d5934b0060a3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4968d9e29bc4d73b46d0799f8353e37a8538c6af3529e07d2fe5b102026e8e4f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2012-04-22T11:00:58Z",
    "title_canon_sha256": "3e39274e2d0d27e9a02aaee90dd1312ca118e72703c0149ddffd00e881afacd9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1204.4878",
    "kind": "arxiv",
    "version": 6
  }
}