Pith Number

pith:7L6NUPDV

pith:2017:7L6NUPDVNEWZV3P74OKUKX5WQ3

not attested not anchored not stored refs pending

A Novel Space-Time Representation on the Positive Semidefinite Con for Facial Expression Recognition

Anis Kacem, Boulbaba Ben Amor, Juan Carlos Alvarez-Paiva, Mohamed Daoudi

arxiv:1707.06440 v1 · 2017-07-20 · cs.CV

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7L6NUPDVNEWZV3P74OKUKX5WQ3}

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	2026-05-18T00:39:53.814952Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fafcda3c75692d9aedffe395455fb686dd94a6b02d68364b709379bac074c2e3

Aliases

arxiv: 1707.06440 · arxiv_version: 1707.06440v1 · doi: 10.48550/arxiv.1707.06440 · pith_short_12: 7L6NUPDVNEWZ · pith_short_16: 7L6NUPDVNEWZV3P7 · pith_short_8: 7L6NUPDV

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/7L6NUPDVNEWZV3P74OKUKX5WQ3 \
  | 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: fafcda3c75692d9aedffe395455fb686dd94a6b02d68364b709379bac074c2e3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cb48c5619dc48858086411f10e6e5a147a5657b04d4884d7c4082790290735b4",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2017-07-20T10:36:12Z",
    "title_canon_sha256": "abca655ca3163200fafa9891c56360733442aa07695552c314f6d877f128e05e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1707.06440",
    "kind": "arxiv",
    "version": 1
  }
}