Pith Number

pith:D5E2IH2Y

pith:2018:D5E2IH2YECF22HREO5OQ2PDI37

not attested not anchored not stored refs pending

Semi-free subgroups of a profinite surface group

Mark Shusterman, Matan Ginzburg

arxiv:1804.07800 v1 · 2018-04-20 · math.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{D5E2IH2YECF22HREO5OQ2PDI37}

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	2026-05-18T00:17:52.755425Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1f49a41f58208bad1e24775d0d3c68dff810754213616ba05dcec33588aecc34

Aliases

arxiv: 1804.07800 · arxiv_version: 1804.07800v1 · doi: 10.48550/arxiv.1804.07800 · pith_short_12: D5E2IH2YECF2 · pith_short_16: D5E2IH2YECF22HRE · pith_short_8: D5E2IH2Y

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/D5E2IH2YECF22HREO5OQ2PDI37 \
  | 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: 1f49a41f58208bad1e24775d0d3c68dff810754213616ba05dcec33588aecc34

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b6613ae4a035b8316a6af25c99ee53294abcc404eee2d58f9c1e86637d22d81e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GR",
    "submitted_at": "2018-04-20T19:04:33Z",
    "title_canon_sha256": "ef2a2f10531916707e0b7c2e84cd4335797ed2bab57ae5a43b178dd394e5c290"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.07800",
    "kind": "arxiv",
    "version": 1
  }
}