Pith Number

pith:Q2CBFOCK

pith:2019:Q2CBFOCKGCL7MNQOPT3JC2WHW4

not attested not anchored not stored refs pending

Graph Fourier Transform Based on $\ell_1$ Norm Variation Minimization

Anna Qi, Chao Huang, Jianfeng Huang, Lihua Yang

arxiv:1908.06672 v1 · 2019-08-19 · cs.IT · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Q2CBFOCKGCL7MNQOPT3JC2WHW4}

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	2026-07-05T00:59:53.669332Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

868412b84a3097f6360e7cf6916ac7b73714ec5843474b73c299589e07fbe4e9

Aliases

arxiv: 1908.06672 · arxiv_version: 1908.06672v1 · doi: 10.48550/arxiv.1908.06672 · pith_short_12: Q2CBFOCKGCL7 · pith_short_16: Q2CBFOCKGCL7MNQO · pith_short_8: Q2CBFOCK

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/Q2CBFOCKGCL7MNQOPT3JC2WHW4 \
  | 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: 868412b84a3097f6360e7cf6916ac7b73714ec5843474b73c299589e07fbe4e9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b6b25c0a11e6c6f10a65f699025204a49d9e4a1d950a740a4045582112037ac3",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2019-08-19T09:57:23Z",
    "title_canon_sha256": "319e945c83a5b1c15ba3c98083c3d8c13ab9f2b91f9bfad5d9876591ecaf1a51"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.06672",
    "kind": "arxiv",
    "version": 1
  }
}