Pith Number

pith:HRPQL3DC

pith:2017:HRPQL3DCVNLRGMWRQSWQXOSW5X

not attested not anchored not stored refs pending

Epitopological and pseudotopological fundamental group functors

Giacomo Dossena

arxiv:1707.05601 v1 · 2017-07-18 · math.AT · math.CT · math.GN

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HRPQL3DCVNLRGMWRQSWQXOSW5X}

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	2026-05-18T00:40:01.931193Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3c5f05ec62ab571332d184ad0bba56edf1f8c7515da975b6656f98d53fe18e21

Aliases

arxiv: 1707.05601 · arxiv_version: 1707.05601v1 · doi: 10.48550/arxiv.1707.05601 · pith_short_12: HRPQL3DCVNLR · pith_short_16: HRPQL3DCVNLRGMWR · pith_short_8: HRPQL3DC

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/HRPQL3DCVNLRGMWRQSWQXOSW5X \
  | 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: 3c5f05ec62ab571332d184ad0bba56edf1f8c7515da975b6656f98d53fe18e21

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "79e54d7eba03ef3b085fc2a54eca425acee39ab331b1f336ec878e65b5afebf6",
    "cross_cats_sorted": [
      "math.CT",
      "math.GN"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2017-07-18T13:28:07Z",
    "title_canon_sha256": "2cce5022d2a8b2a91e150de436b8eb19000639a60f7c0cb0f904eab1e3ef20f3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1707.05601",
    "kind": "arxiv",
    "version": 1
  }
}