Pith Number

pith:QHJ5BYXO

pith:2017:QHJ5BYXOYZP67YYUZFQJWFS7LL

not attested not anchored not stored refs pending

Equations Of Kalman Varieties

Hang Huang

arxiv:1707.08699 v1 · 2017-07-27 · math.AC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QHJ5BYXOYZP67YYUZFQJWFS7LL}

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	2026-05-18T00:39:22.236476Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81d3d0e2eec65fefe314c9609b165f5afe51eba42755a4aaf6233acae1683a09

Aliases

arxiv: 1707.08699 · arxiv_version: 1707.08699v1 · doi: 10.48550/arxiv.1707.08699 · pith_short_12: QHJ5BYXOYZP6 · pith_short_16: QHJ5BYXOYZP67YYU · pith_short_8: QHJ5BYXO

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/QHJ5BYXOYZP67YYUZFQJWFS7LL \
  | 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: 81d3d0e2eec65fefe314c9609b165f5afe51eba42755a4aaf6233acae1683a09

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6923763554392bac9a98aacbebcd77cc78d5188f7b97d95b5c453278ba7fdfed",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AC",
    "submitted_at": "2017-07-27T03:51:21Z",
    "title_canon_sha256": "fe40617d78479eb391123fbe8ebab1c1a4279ba7ae72762f3f95dcdcaaa02680"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1707.08699",
    "kind": "arxiv",
    "version": 1
  }
}