Pith Number

pith:NXENNPNQ

pith:2018:NXENNPNQ2CMHQOO26PBYWBRKQ2

not attested not anchored not stored refs pending

Fr\'echet differentiability in Fr\'echet spaces, and differential equations with unbounded variable delay

Hans-Otto Walther

arxiv:1801.09213 v1 · 2018-01-28 · 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{NXENNPNQ2CMHQOO26PBYWBRKQ2}

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	2026-05-18T00:24:58.224542Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6dc8d6bdb0d0987839daf3c38b062a86b280ad4190747785b148c34c4dd6fa86

Aliases

arxiv: 1801.09213 · arxiv_version: 1801.09213v1 · doi: 10.48550/arxiv.1801.09213 · pith_short_12: NXENNPNQ2CMH · pith_short_16: NXENNPNQ2CMHQOO2 · pith_short_8: NXENNPNQ

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/NXENNPNQ2CMHQOO26PBYWBRKQ2 \
  | 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: 6dc8d6bdb0d0987839daf3c38b062a86b280ad4190747785b148c34c4dd6fa86

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "69f90a997e2e9ed5f983c0cff946b9e550d925a48d3871b819f346d7de21da9a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DS",
    "submitted_at": "2018-01-28T11:42:45Z",
    "title_canon_sha256": "4499a6023d88b65090229f8848dfec94a65654cad318623bf4abc6d97a3c1d44"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.09213",
    "kind": "arxiv",
    "version": 1
  }
}