Pith Number

pith:XMHUADL5

pith:2011:XMHUADL5G3UYR3EFWYJOV2A3PP

not attested not anchored not stored refs pending

A Note On Estimating the Spectral Norm of A Matrix Efficiently

Malik Magdon-Ismail

arxiv:1104.2076 v1 · 2011-04-11 · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XMHUADL5G3UYR3EFWYJOV2A3PP}

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	2026-05-18T04:24:35.916819Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bb0f400d7d36e988ec85b612eae81b7bd01164d8939faa347bfedf258abd3d38

Aliases

arxiv: 1104.2076 · arxiv_version: 1104.2076v1 · doi: 10.48550/arxiv.1104.2076 · pith_short_12: XMHUADL5G3UY · pith_short_16: XMHUADL5G3UYR3EF · pith_short_8: XMHUADL5

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/XMHUADL5G3UYR3EFWYJOV2A3PP \
  | 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: bb0f400d7d36e988ec85b612eae81b7bd01164d8939faa347bfedf258abd3d38

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "22d96ec98f623862b52a7c9913ca3ab1385c0f880ac602ed014db1847573b4bd",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2011-04-11T22:06:19Z",
    "title_canon_sha256": "21ea6451ad6a6132efc2e168c4418f66b532518f4f012ed5a919ba15c8fa76aa"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1104.2076",
    "kind": "arxiv",
    "version": 1
  }
}