Pith Number

pith:GUW53TW7

pith:2009:GUW53TW7IVRDACU4YURXNYE55V

not attested not anchored not stored refs pending

Cohomological classification of Ann-functors

Dang Dinh Hanh, Nguyen Tien Quang

arxiv:0904.4167 v1 · 2009-04-27 · math.CT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{GUW53TW7IVRDACU4YURXNYE55V}

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	2026-05-18T03:37:09.543186Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

352dddcedf4562300a9cc52376e09ded7c87d3e0b6855434a2e6083e5b482934

Aliases

arxiv: 0904.4167 · arxiv_version: 0904.4167v1 · doi: 10.48550/arxiv.0904.4167 · pith_short_12: GUW53TW7IVRD · pith_short_16: GUW53TW7IVRDACU4 · pith_short_8: GUW53TW7

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/GUW53TW7IVRDACU4YURXNYE55V \
  | 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: 352dddcedf4562300a9cc52376e09ded7c87d3e0b6855434a2e6083e5b482934

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "675ebe66e0f742e37382fe051dcf1f98c69322cb81d9e7164cc393eef6c56241",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CT",
    "submitted_at": "2009-04-27T14:15:46Z",
    "title_canon_sha256": "aec557e7505490fb8bb4a9f6951ce00e524780a46d65dd1eda047d6532dd1564"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.4167",
    "kind": "arxiv",
    "version": 1
  }
}