Pith Number

pith:E26H4WPA

pith:2019:E26H4WPAC6VZJGETMSINJR6IWZ

not attested not anchored not stored refs pending

The alternating central extension for the positive part of $U_q(\widehat{\mathfrak{sl}}_2)$

Paul Terwilliger

arxiv:1907.09872 v1 · 2019-07-23 · math.QA · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{E26H4WPAC6VZJGETMSINJR6IWZ}

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	2026-05-17T23:39:49.837426Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

26bc7e59e017ab9498936490d4c7c8b65cc9f0acbcd098fdc47843b23d961a34

Aliases

arxiv: 1907.09872 · arxiv_version: 1907.09872v1 · doi: 10.48550/arxiv.1907.09872 · pith_short_12: E26H4WPAC6VZ · pith_short_16: E26H4WPAC6VZJGET · pith_short_8: E26H4WPA

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/E26H4WPAC6VZJGETMSINJR6IWZ \
  | 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: 26bc7e59e017ab9498936490d4c7c8b65cc9f0acbcd098fdc47843b23d961a34

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2d391ae27ff34a17cc5636e3c09dd4e68c0846eb4ec35dc68f54285b73399273",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.QA",
    "submitted_at": "2019-07-23T13:37:04Z",
    "title_canon_sha256": "a4a4edae56dc0dc86c0273cc4dbe445bcf2bd0006e0c1c44d46a15e8001958d7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.09872",
    "kind": "arxiv",
    "version": 1
  }
}