Pith Number

pith:7QKXKIFK

pith:2019:7QKXKIFKODQASBNLIIA6GAYGVX

not attested not anchored not stored refs pending

The surrogate matrix methodology: a priori error estimation

Barbara Wohlmuth, Brendan Keith, Daniel Drzisga

arxiv:1902.07333 v1 · 2019-02-19 · 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{7QKXKIFKODQASBNLIIA6GAYGVX}

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	2026-06-04T20:13:54.840155Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc157520aa70e00905ab4201e30306adc5f7dc5375a6d16c4a13eaba8707402d

Aliases

arxiv: 1902.07333 · arxiv_version: 1902.07333v1 · doi: 10.48550/arxiv.1902.07333 · pith_short_12: 7QKXKIFKODQA · pith_short_16: 7QKXKIFKODQASBNL · pith_short_8: 7QKXKIFK

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/7QKXKIFKODQASBNLIIA6GAYGVX \
  | 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: fc157520aa70e00905ab4201e30306adc5f7dc5375a6d16c4a13eaba8707402d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "17c5974d20f33de9519f1531832fc18eb9f9a254e448b475dfc1020a148e76f1",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2019-02-19T22:43:14Z",
    "title_canon_sha256": "84280b5cadc1d90b167732bfb03c46227513050a41df27f7a1a8335c4c547066"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.07333",
    "kind": "arxiv",
    "version": 1
  }
}