Pith Number

pith:5P6A263G

pith:2019:5P6A263GD3IJKEHBATVD44MUOT

not attested not anchored not stored refs pending

An Improved Quantum Projection Filter

Guofeng Zhang, Ian R. Petersen, Qing Gao

arxiv:1909.13524 v1 · 2019-09-30 · quant-ph · cs.SY · eess.SY · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5P6A263GD3IJKEHBATVD44MUOT}

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	2026-07-05T00:08:11.093506Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ebfc0d7b661ed09510e104ea3e719474f2b5d8a32e6c389ca180520fb46a8014

Aliases

arxiv: 1909.13524 · arxiv_version: 1909.13524v1 · doi: 10.48550/arxiv.1909.13524 · pith_short_12: 5P6A263GD3IJ · pith_short_16: 5P6A263GD3IJKEHB · pith_short_8: 5P6A263G

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/5P6A263GD3IJKEHBATVD44MUOT \
  | 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: ebfc0d7b661ed09510e104ea3e719474f2b5d8a32e6c389ca180520fb46a8014

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "310d4d8c612e7163cfb2e51f173f465d144605969ab91ec5f7117b43513a67ab",
    "cross_cats_sorted": [
      "cs.SY",
      "eess.SY",
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2019-09-30T08:50:54Z",
    "title_canon_sha256": "9e412af84d84673b192a44cbe2ef4dc424a6156cb5565915b7ca4b17c7e5c2c2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.13524",
    "kind": "arxiv",
    "version": 1
  }
}