Pith Number

pith:6RL6UHAZ

pith:2011:6RL6UHAZ7PEBTCONZA2IUAGL32

not attested not anchored not stored refs pending

The Complexity of Surjective Homomorphism Problems -- a Survey

Barnaby Martin, Jan Kara, Manuel Bodirsky

arxiv:1104.5257 v2 · 2011-04-27 · cs.CC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{6RL6UHAZ7PEBTCONZA2IUAGL32}

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	2026-05-18T04:12:20.931998Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f457ea1c19fbc81989cdc8348a00cbde9f2aad748a29bfa9fc9ca3bf7a4d61d4

Aliases

arxiv: 1104.5257 · arxiv_version: 1104.5257v2 · doi: 10.48550/arxiv.1104.5257 · pith_short_12: 6RL6UHAZ7PEB · pith_short_16: 6RL6UHAZ7PEBTCON · pith_short_8: 6RL6UHAZ

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/6RL6UHAZ7PEBTCONZA2IUAGL32 \
  | 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: f457ea1c19fbc81989cdc8348a00cbde9f2aad748a29bfa9fc9ca3bf7a4d61d4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6ee42a265568d6842e70cbb99836b41b13ced756d28d0f97efbc7c2d92aee78d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2011-04-27T21:42:53Z",
    "title_canon_sha256": "903877d19696c1ff4e3eef0828f562791da3568f153685e8996e20dfa9871909"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1104.5257",
    "kind": "arxiv",
    "version": 2
  }
}