Pith Number

pith:QHXSFVRW

pith:2011:QHXSFVRWK36KAZBGP7KPAKHG3D

not attested not anchored not stored refs pending

Incompressibility of orthogonal grassmannians

Nikita A. Karpenko

arxiv:1107.0438 v2 · 2011-07-03 · math.AG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QHXSFVRWK36KAZBGP7KPAKHG3D}

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	2026-05-18T04:11:17.723539Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81ef22d63656fca064267fd4f028e6d8ddf4c308d4f69e7179f32c036e7622bd

Aliases

arxiv: 1107.0438 · arxiv_version: 1107.0438v2 · doi: 10.48550/arxiv.1107.0438 · pith_short_12: QHXSFVRWK36K · pith_short_16: QHXSFVRWK36KAZBG · pith_short_8: QHXSFVRW

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/QHXSFVRWK36KAZBGP7KPAKHG3D \
  | 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: 81ef22d63656fca064267fd4f028e6d8ddf4c308d4f69e7179f32c036e7622bd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bd45c41e3bb3c8a7093a19b3ea5c5bb0fac16eaa2706c54e2d29c807c04ef145",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2011-07-03T08:58:42Z",
    "title_canon_sha256": "712301f2f01058f7449efabfbb7f755b1abda7ef4bf58263a176d84b6a76f385"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1107.0438",
    "kind": "arxiv",
    "version": 2
  }
}