Pith Number

pith:7H5EO2IX

pith:2017:7H5EO2IXCXQVI3LOU4OE3MKIRA

not attested not anchored not stored refs pending

Surjective H-Colouring: New Hardness Results

Anthony Stewart, Daniel Paulusma, Matthew Johnson. Barnaby Martin, Petr Golovach

arxiv:1701.02188 v2 · 2017-01-09 · cs.CC · 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{7H5EO2IXCXQVI3LOU4OE3MKIRA}

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	2026-05-18T00:47:56.544679Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f9fa47691715e1546d6ea71c4db148881ad54e8373d4dd98fbfb0be3de3bf48f

Aliases

arxiv: 1701.02188 · arxiv_version: 1701.02188v2 · doi: 10.48550/arxiv.1701.02188 · pith_short_12: 7H5EO2IXCXQV · pith_short_16: 7H5EO2IXCXQVI3LO · pith_short_8: 7H5EO2IX

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/7H5EO2IXCXQVI3LOU4OE3MKIRA \
  | 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: f9fa47691715e1546d6ea71c4db148881ad54e8373d4dd98fbfb0be3de3bf48f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "de4262ac668e2567b786081eef0a8f17402524ee0064da32a14a4b6a24057302",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2017-01-09T14:17:28Z",
    "title_canon_sha256": "8d0406a77600a131ecd79b74ab63cb19d55fc5543c80d25f0ce81be78ddef382"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1701.02188",
    "kind": "arxiv",
    "version": 2
  }
}