Pith Number

pith:FQJPG5O7

pith:2017:FQJPG5O73SKE7LJ55G6LSVUJYR

not attested not anchored not stored refs pending

A New Framework for $\mathcal{H}_2$-Optimal Model Reduction

Alessandro Castagnotto, Boris Lohmann

arxiv:1709.07270 v1 · 2017-09-21 · math.NA · cs.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{FQJPG5O73SKE7LJ55G6LSVUJYR}

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	2026-05-18T00:34:36.156072Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2c12f375dfdc944fad3de9bcb95689c440c6acc9e883143f4fff6847da9cc310

Aliases

arxiv: 1709.07270 · arxiv_version: 1709.07270v1 · doi: 10.48550/arxiv.1709.07270 · pith_short_12: FQJPG5O73SKE · pith_short_16: FQJPG5O73SKE7LJ5 · pith_short_8: FQJPG5O7

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/FQJPG5O73SKE7LJ55G6LSVUJYR \
  | 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: 2c12f375dfdc944fad3de9bcb95689c440c6acc9e883143f4fff6847da9cc310

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6f410aba39913166e06599efeeccbe9f37c9bfee68c93cb03f30aed5f477b3d3",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2017-09-21T11:46:20Z",
    "title_canon_sha256": "7f16a495204fb44c4f500368d3033e9d61b4b1930b1a6bfeec72697d63fa64c0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1709.07270",
    "kind": "arxiv",
    "version": 1
  }
}