Pith Number

pith:7WM6PKWH

pith:2019:7WM6PKWHPSNBFPM3XTJ66H5ARO

not attested not anchored not stored refs pending

On equivalence of singularities of linear second order ordinary differential equations by point transformations

Martin Klimes

arxiv:1904.03426 v1 · 2019-04-06 · math.CA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7WM6PKWHPSNBFPM3XTJ66H5ARO}

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	2026-05-17T23:49:13.432186Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fd99e7aac77c9a12bd9bbcd3ef1fa08bb72ca7148e66406a407481190b92f307

Aliases

arxiv: 1904.03426 · arxiv_version: 1904.03426v1 · doi: 10.48550/arxiv.1904.03426 · pith_short_12: 7WM6PKWHPSNB · pith_short_16: 7WM6PKWHPSNBFPM3 · pith_short_8: 7WM6PKWH

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/7WM6PKWHPSNBFPM3XTJ66H5ARO \
  | 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: fd99e7aac77c9a12bd9bbcd3ef1fa08bb72ca7148e66406a407481190b92f307

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e66fa67cfae22ff767e2c8f2412bf7f1bc9d02afd6da65e5397ea8b799ea7679",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CA",
    "submitted_at": "2019-04-06T12:19:28Z",
    "title_canon_sha256": "700990dbdf3c110ad8627fd1074345c857480b2ece0f416c67dd774ad24a9f1f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.03426",
    "kind": "arxiv",
    "version": 1
  }
}