Pith Number

pith:Q663KOI6

pith:2021:Q663KOI66JLGGBRDLCXCJOFY3L

not attested not anchored not stored refs pending

Sparsity-Specific Code Optimization using Expression Trees

Daniele Panozzo, Olga Sorkine-Hornung, Philipp Herholz, Shoaib Kamil, Teseo Schneider, Xuan Tang

arxiv:2110.12865 v2 · 2021-10-15 · cs.PL · cs.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Q663KOI66JLGGBRDLCXCJOFY3L}

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	2026-07-05T04:04:43.056876Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

87bdb5391ef25663062358ae24b8b8dac75258a8b7e950fbf6e369dd79f0f7f8

Aliases

arxiv: 2110.12865 · arxiv_version: 2110.12865v2 · doi: 10.48550/arxiv.2110.12865 · pith_short_12: Q663KOI66JLG · pith_short_16: Q663KOI66JLGGBRD · pith_short_8: Q663KOI6

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/Q663KOI66JLGGBRDLCXCJOFY3L \
  | 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: 87bdb5391ef25663062358ae24b8b8dac75258a8b7e950fbf6e369dd79f0f7f8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "70a4a7b8c65b2feee02f49b9db80aec95b80b82880d6bcef8273557a77bfbc3a",
    "cross_cats_sorted": [
      "cs.GR"
    ],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "cs.PL",
    "submitted_at": "2021-10-15T14:33:28Z",
    "title_canon_sha256": "7220121ad9038c36de8c30a55960d796be36cbe7bbbaf67dd4da89d90d0ba9f3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2110.12865",
    "kind": "arxiv",
    "version": 2
  }
}