Pith Number

pith:I2Y44HJ7

pith:2018:I2Y44HJ7HWCBWJUTJZHSUYS7CR

not attested not anchored not stored refs pending

The functor of singular chains detects weak homotopy equivalences

Felix Wierstra, Mahmoud Zeinalian, Manuel Rivera

arxiv:1808.10237 v3 · 2018-08-30 · math.AT · math.QA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{I2Y44HJ7HWCBWJUTJZHSUYS7CR}

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	2026-05-17T23:55:42.601462Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

46b1ce1d3f3d841b26934e4f2a625f1479ed1c532d281fa92c2fddea301b995e

Aliases

arxiv: 1808.10237 · arxiv_version: 1808.10237v3 · doi: 10.48550/arxiv.1808.10237 · pith_short_12: I2Y44HJ7HWCB · pith_short_16: I2Y44HJ7HWCBWJUT · pith_short_8: I2Y44HJ7

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/I2Y44HJ7HWCBWJUTJZHSUYS7CR \
  | 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: 46b1ce1d3f3d841b26934e4f2a625f1479ed1c532d281fa92c2fddea301b995e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dc254569f982d659359c02f50a50fc02fa770e015fcb3b0e29a280521dff0e52",
    "cross_cats_sorted": [
      "math.QA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2018-08-30T11:43:04Z",
    "title_canon_sha256": "e68ea5ccba5293602fe952a9f8f81819a3276a85094c93e0bae24084aa350a5b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1808.10237",
    "kind": "arxiv",
    "version": 3
  }
}