Pith Number

pith:T5FAIPE5

pith:2017:T5FAIPE5R2HZDW4WCLMXJRKAFL

not attested not anchored not stored refs pending

A four point characterisation for coarse median spaces

Graham A. Niblo, Jiawen Zhang, Nick Wright

arxiv:1708.06960 v2 · 2017-08-23 · math.MG · 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{T5FAIPE5R2HZDW4WCLMXJRKAFL}

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	2026-05-18T00:23:58.925117Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9f4a043c9d8e8f91db9612d974c5402ae20ab8cf8436ad579d1198a5612f2af7

Aliases

arxiv: 1708.06960 · arxiv_version: 1708.06960v2 · doi: 10.48550/arxiv.1708.06960 · pith_short_12: T5FAIPE5R2HZ · pith_short_16: T5FAIPE5R2HZDW4W · pith_short_8: T5FAIPE5

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/T5FAIPE5R2HZDW4WCLMXJRKAFL \
  | 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: 9f4a043c9d8e8f91db9612d974c5402ae20ab8cf8436ad579d1198a5612f2af7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "23977a5e2367238ed66449dcd5c57303bcdcc85b4c218bc54c6fef288248ca9f",
    "cross_cats_sorted": [
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.MG",
    "submitted_at": "2017-08-23T11:31:07Z",
    "title_canon_sha256": "8b586e17005746fd4343eb93859141d3aec79f633ce78e82088122a2180143d7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1708.06960",
    "kind": "arxiv",
    "version": 2
  }
}