Pith Number

pith:QSX4MPZJ

pith:2026:QSX4MPZJHLTZNPS4W2LQXVZACS

not attested not anchored not stored refs pending

Multilevel Adaptive-Rank Methods for Linear and Nonlinear Systems in the Hierarchical Tucker Format

Nathan V. Roberts, Pierson T. Guthrey, William A. Sands

arxiv:2606.21750 v1 · 2026-06-19 · math.NA · cs.NA · physics.comp-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QSX4MPZJHLTZNPS4W2LQXVZACS}

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	2026-06-23T01:13:21.464444Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

84afc63f293ae796be5cb6970bd7201488fa1b12b3951320b64fe3e58dcbdeb3

Aliases

arxiv: 2606.21750 · arxiv_version: 2606.21750v1 · doi: 10.48550/arxiv.2606.21750 · pith_short_12: QSX4MPZJHLTZ · pith_short_16: QSX4MPZJHLTZNPS4 · pith_short_8: QSX4MPZJ

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/QSX4MPZJHLTZNPS4W2LQXVZACS \
  | 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: 84afc63f293ae796be5cb6970bd7201488fa1b12b3951320b64fe3e58dcbdeb3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e6b524552d838b53714a74a6a35681c341e6ab5eddf400507e93a6c8e8dc81f6",
    "cross_cats_sorted": [
      "cs.NA",
      "physics.comp-ph"
    ],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2026-06-19T21:08:18Z",
    "title_canon_sha256": "2cee37cef74a65d4054e4e1c671e6cfb83a85e8facbe52e4b4a845fd90169bc6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.21750",
    "kind": "arxiv",
    "version": 1
  }
}