Pith Number

pith:LN3IXUUP

pith:2015:LN3IXUUPGPHMZL4D2V6BPKPP4I

not attested not anchored not stored refs pending

Computing Active Subspaces Efficiently with Gradient Sketching

Armin Eftekhari, Michael B. Wakin, Paul G. Constantine

arxiv:1506.04190 v2 · 2015-06-12 · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{LN3IXUUPGPHMZL4D2V6BPKPP4I}

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	2026-05-18T01:30:34.405620Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5b768bd28f33ceccaf83d57c17a9efe222de26821dd2c97ae50f6ef56763dfd3

Aliases

arxiv: 1506.04190 · arxiv_version: 1506.04190v2 · doi: 10.48550/arxiv.1506.04190 · pith_short_12: LN3IXUUPGPHM · pith_short_16: LN3IXUUPGPHMZL4D · pith_short_8: LN3IXUUP

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/LN3IXUUPGPHMZL4D2V6BPKPP4I \
  | 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: 5b768bd28f33ceccaf83d57c17a9efe222de26821dd2c97ae50f6ef56763dfd3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "976ef46e3685b76c4ef8a2ff6e1c926ac544e2d471089385091fec1166bc2f3d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2015-06-12T22:03:12Z",
    "title_canon_sha256": "d965c4d3e8014e93a17de5ad334ce990745e9a2fc85bcb91a745dee1b03f3d3e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1506.04190",
    "kind": "arxiv",
    "version": 2
  }
}