Pith Number

pith:TBIW6YDS

pith:2018:TBIW6YDSEPZXZ3AKFBJ2JLDP23

not attested not anchored not stored refs pending

Q-curve and area rules for choosing heuristic parameter in Tikhonov regularization

Toomas Raus, Uno H\"amarik

arxiv:1809.02061 v1 · 2018-09-06 · 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{TBIW6YDSEPZXZ3AKFBJ2JLDP23}

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	2026-05-18T00:06:17.875411Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

98516f607223f37cec0a2853a4ac6fd6dab07b7455b9d090d93df23d9263088a

Aliases

arxiv: 1809.02061 · arxiv_version: 1809.02061v1 · doi: 10.48550/arxiv.1809.02061 · pith_short_12: TBIW6YDSEPZX · pith_short_16: TBIW6YDSEPZXZ3AK · pith_short_8: TBIW6YDS

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/TBIW6YDSEPZXZ3AKFBJ2JLDP23 \
  | 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: 98516f607223f37cec0a2853a4ac6fd6dab07b7455b9d090d93df23d9263088a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f2401c3bf903f1f04355bf1a88b10278a79060044b2442bc6cface5129381131",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-09-06T15:50:39Z",
    "title_canon_sha256": "678f1335e1dacf2645d9a1fb042286285edc1faa3827ca2fb6be1576a602a876"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1809.02061",
    "kind": "arxiv",
    "version": 1
  }
}