Pith Number

pith:GNKTJPUZ

pith:2016:GNKTJPUZ3ONC2CE4IUTFA6FDOP

not attested not anchored not stored refs pending

Non-Tiles and Walls - A Variant on the Heesch Problem

Erich Friedman, R. Nandakumar

arxiv:1605.09203 v2 · 2016-05-21 · math.HO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{GNKTJPUZ3ONC2CE4IUTFA6FDOP}

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	2026-05-18T01:13:10.790088Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

335534be99db9a2d089c45265078a373f2056a6e75e5bf6a81b555368fda52df

Aliases

arxiv: 1605.09203 · arxiv_version: 1605.09203v2 · doi: 10.48550/arxiv.1605.09203 · pith_short_12: GNKTJPUZ3ONC · pith_short_16: GNKTJPUZ3ONC2CE4 · pith_short_8: GNKTJPUZ

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/GNKTJPUZ3ONC2CE4IUTFA6FDOP \
  | 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: 335534be99db9a2d089c45265078a373f2056a6e75e5bf6a81b555368fda52df

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "09a363bbde15530483aa02526e1754b209f43359628eedeb756a8b9eebbe9b2c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2016-05-21T10:09:00Z",
    "title_canon_sha256": "6a60afc770a61844daeb554a8ba825e99d19bf89513a9fc520c30706b607899e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1605.09203",
    "kind": "arxiv",
    "version": 2
  }
}