Pith Number

pith:N35DRCXS

pith:2018:N35DRCXSZ4SCYF2ZRVL6XDH3RK

not attested not anchored not stored refs pending

On the non-existence of local Birkhoff coordinates for the focusing NLS equation

P. Topalov, T. Kappeler

arxiv:1807.02455 v2 · 2018-07-06 · math.AP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{N35DRCXSZ4SCYF2ZRVL6XDH3RK}

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	2026-05-18T00:04:39.215311Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6efa388af2cf242c17598d57eb8cfb8aa2ce0247fd99dd864ef36d1133160c9e

Aliases

arxiv: 1807.02455 · arxiv_version: 1807.02455v2 · doi: 10.48550/arxiv.1807.02455 · pith_short_12: N35DRCXSZ4SC · pith_short_16: N35DRCXSZ4SCYF2Z · pith_short_8: N35DRCXS

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/N35DRCXSZ4SCYF2ZRVL6XDH3RK \
  | 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: 6efa388af2cf242c17598d57eb8cfb8aa2ce0247fd99dd864ef36d1133160c9e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f6b4993379a5ec0fdc87b5fe798d9589df105ac9d8bdefee752a868051924008",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2018-07-06T15:30:27Z",
    "title_canon_sha256": "4afd42fa8c88d62b63fc0c7ca4ec5a06568db4837bdca5f84267144f9bc1ea60"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.02455",
    "kind": "arxiv",
    "version": 2
  }
}