Pith Number

pith:OBE6KHXF

pith:2012:OBE6KHXFFFQMT3NJUXMVHCI7B4

not attested not anchored not stored refs pending

Computation of eigenvalues by numerical upscaling

Axel Malqvist, Daniel Peterseim

arxiv:1212.0090 v3 · 2012-12-01 · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OBE6KHXFFFQMT3NJUXMVHCI7B4}

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	2026-05-18T02:43:09.539171Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7049e51ee52960c9eda9a5d953891f0f371e2ece420094d129d32165f8fbc036

Aliases

arxiv: 1212.0090 · arxiv_version: 1212.0090v3 · doi: 10.48550/arxiv.1212.0090 · pith_short_12: OBE6KHXFFFQM · pith_short_16: OBE6KHXFFFQMT3NJ · pith_short_8: OBE6KHXF

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/OBE6KHXFFFQMT3NJUXMVHCI7B4 \
  | 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: 7049e51ee52960c9eda9a5d953891f0f371e2ece420094d129d32165f8fbc036

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1e765081c588f3c3e02a2e40b8aa2dc09e4861cba3293b44b8a77ae5a2272f7c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2012-12-01T09:42:22Z",
    "title_canon_sha256": "ab1af10b978af42e13cef8599208dc2d44e8b58b2091dff855ec080102a6f49f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1212.0090",
    "kind": "arxiv",
    "version": 3
  }
}