Pith Number

pith:AK7H4UXM

pith:2002:AK7H4UXMHFND3YPRZ7QC4F6V5T

not attested not anchored not stored refs pending

Parameter Estimation of Sigmoid Superpositions: Dynamical System Approach

Cees van Leeuwen, Danil Prokhorov, Ivan Tyukin

arxiv:math/0207075 v2 · 2002-07-09 · math.OC · math.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{AK7H4UXMHFND3YPRZ7QC4F6V5T}

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	2026-05-18T01:05:29.466083Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

02be7e52ec395a3de1f1cfe02e17d5ecfd11f02146ffd484762055c38ff793b4

Aliases

arxiv: math/0207075 · arxiv_version: math/0207075v2 · doi: 10.48550/arxiv.math/0207075 · pith_short_12: AK7H4UXMHFND · pith_short_16: AK7H4UXMHFND3YPR · pith_short_8: AK7H4UXM

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/AK7H4UXMHFND3YPRZ7QC4F6V5T \
  | 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: 02be7e52ec395a3de1f1cfe02e17d5ecfd11f02146ffd484762055c38ff793b4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "40b8000b9be258513b8c9c5a58caa97d0524e30afb8a688343b6d0daf2b141d8",
    "cross_cats_sorted": [
      "math.DS"
    ],
    "license": "",
    "primary_cat": "math.OC",
    "submitted_at": "2002-07-09T15:02:43Z",
    "title_canon_sha256": "1e15a06f7e1b1010b3d1c843cec3c6597dc7762176b5b0dd3ceb9b540be02b1c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0207075",
    "kind": "arxiv",
    "version": 2
  }
}