Pith Number

pith:7FFQWO4R

pith:2018:7FFQWO4RDXJCUBP2SGFXDQQHLK

not attested not anchored not stored refs pending

Sparse solutions in optimal control of PDEs with uncertain parameters: the linear case

Chen Li, Georg Stadler

arxiv:1804.05678 v3 · 2018-04-16 · math.NA · math.OC · stat.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7FFQWO4RDXJCUBP2SGFXDQQHLK}

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	2026-05-18T00:00:30.463152Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f94b0b3b911dd22a05fa918b71c2075ab97fc23cfc0706b12f88b7f7bbd2f678

Aliases

arxiv: 1804.05678 · arxiv_version: 1804.05678v3 · doi: 10.48550/arxiv.1804.05678 · pith_short_12: 7FFQWO4RDXJC · pith_short_16: 7FFQWO4RDXJCUBP2 · pith_short_8: 7FFQWO4R

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/7FFQWO4RDXJCUBP2SGFXDQQHLK \
  | 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: f94b0b3b911dd22a05fa918b71c2075ab97fc23cfc0706b12f88b7f7bbd2f678

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bad8b7a2423a336c905a6b5dc4a0cf5ef05bc423e2604865cc225475a655501d",
    "cross_cats_sorted": [
      "math.OC",
      "stat.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-04-16T13:48:57Z",
    "title_canon_sha256": "051ad20a0b10cb58ea351ef1edb03ed328eb9d954fad5383d3fc718e2b23405e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.05678",
    "kind": "arxiv",
    "version": 3
  }
}