Pith Number

pith:W6PO4BWQ

pith:2011:W6PO4BWQX2VTFDSFB3AIHUB527

not attested not anchored not stored refs pending

The infimum of the Nijenhuis energy

Jonathan David Evans

arxiv:1109.4854 v2 · 2011-09-22 · math.SG · math.DG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W6PO4BWQX2VTFDSFB3AIHUB527}

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	2026-05-18T03:49:35.064887Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b79eee06d0beab328e450ec083d03dd7d9da084c8d223b10978f67c0eba9acbe

Aliases

arxiv: 1109.4854 · arxiv_version: 1109.4854v2 · doi: 10.48550/arxiv.1109.4854 · pith_short_12: W6PO4BWQX2VT · pith_short_16: W6PO4BWQX2VTFDSF · pith_short_8: W6PO4BWQ

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/W6PO4BWQX2VTFDSFB3AIHUB527 \
  | 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: b79eee06d0beab328e450ec083d03dd7d9da084c8d223b10978f67c0eba9acbe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a33cb7eeec1a4a8cf2fa19585f97518a33ca69cc89d72fd60f210ffd523cc798",
    "cross_cats_sorted": [
      "math.DG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.SG",
    "submitted_at": "2011-09-22T15:41:50Z",
    "title_canon_sha256": "b189d459f5553e010cf5435aa24871256a5e6d3d68b9279d91aad554726aa94b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.4854",
    "kind": "arxiv",
    "version": 2
  }
}