Pith Number

pith:J2RH4N3S

pith:2008:J2RH4N3SRWRCLKJ7A57RMU4TAG

not attested not anchored not stored refs pending

Best subspace tensor approximations

S. Friedland, V. Mehrmann

arxiv:0805.4220 v1 · 2008-05-27 · math.NA · cs.NA · 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{J2RH4N3SRWRCLKJ7A57RMU4TAG}

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	2026-06-03T22:06:06.488549Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4ea27e37728da225a93f077f16539301947155a34e8fdb3c848377d26ac1006c

Aliases

arxiv: 0805.4220 · arxiv_version: 0805.4220v1 · doi: 10.48550/arxiv.0805.4220 · pith_short_12: J2RH4N3SRWRC · pith_short_16: J2RH4N3SRWRCLKJ7 · pith_short_8: J2RH4N3S

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/J2RH4N3SRWRCLKJ7A57RMU4TAG \
  | 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: 4ea27e37728da225a93f077f16539301947155a34e8fdb3c848377d26ac1006c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "65879c939544a862b30922c52d2327620315906a02b686b930df37b2c8b3d630",
    "cross_cats_sorted": [
      "cs.NA",
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2008-05-27T21:15:22Z",
    "title_canon_sha256": "cc41405ed972f6aa59024a7d99c6f06fa8b29292648b8b891e94105199e1e90b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0805.4220",
    "kind": "arxiv",
    "version": 1
  }
}