Pith Number

pith:OGDTT5XF

pith:2017:OGDTT5XFGZ4SFRD4AMKIOUZ44J

not attested not anchored not stored refs pending

Calculating obstruction groups for E-infinity ring spectra

Tyler Lawson

arxiv:1709.09629 v1 · 2017-09-27 · 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{OGDTT5XFGZ4SFRD4AMKIOUZ44J}

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	2026-05-18T00:34:11.087608Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

718739f6e5367922c47c031487533ce256a47a470a82bf282329ae76fef9925a

Aliases

arxiv: 1709.09629 · arxiv_version: 1709.09629v1 · doi: 10.48550/arxiv.1709.09629 · pith_short_12: OGDTT5XFGZ4S · pith_short_16: OGDTT5XFGZ4SFRD4 · pith_short_8: OGDTT5XF

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/OGDTT5XFGZ4SFRD4AMKIOUZ44J \
  | 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: 718739f6e5367922c47c031487533ce256a47a470a82bf282329ae76fef9925a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a89d0f4b55aa529019e435de38307ea26bc184ce9c46ab0e0c0c85b92ba98d56",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2017-09-27T17:13:15Z",
    "title_canon_sha256": "852061fb52c3f4cd34911e2fdddd27466ec876b0073ed80be7013613e6d34f85"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1709.09629",
    "kind": "arxiv",
    "version": 1
  }
}