Pith Number

pith:ZS45KT3D

pith:2017:ZS45KT3DSDDTRGM3NP5JSXTKAI

not attested not anchored not stored refs pending

Planar polynomials and an extremal problem of Fischer and Matousek

Craig Timmons, Rex W. Matthews, Robert S. Coulter

arxiv:1702.01357 v1 · 2017-02-05 · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZS45KT3DSDDTRGM3NP5JSXTKAI}

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	2026-05-18T00:51:23.661513Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ccb9d54f6390c738999b6bfa995e6a0224f1091b943019551f9f898a8d973793

Aliases

arxiv: 1702.01357 · arxiv_version: 1702.01357v1 · doi: 10.48550/arxiv.1702.01357 · pith_short_12: ZS45KT3DSDDT · pith_short_16: ZS45KT3DSDDTRGM3 · pith_short_8: ZS45KT3D

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/ZS45KT3DSDDTRGM3NP5JSXTKAI \
  | 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: ccb9d54f6390c738999b6bfa995e6a0224f1091b943019551f9f898a8d973793

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a9f93b872e096722b04a59d572952eaa8e615b7e5b5fbb34225c14e01010db30",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2017-02-05T01:47:16Z",
    "title_canon_sha256": "19bd849d987233734f6e0ae14e7300b2a1a3df05ab98543598cebfb02ad5bb09"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1702.01357",
    "kind": "arxiv",
    "version": 1
  }
}