Pith Number

pith:HH5I2JAS

pith:2009:HH5I2JAS35MHMJX4TO7NUTLBOU

not attested not anchored not stored refs pending

Friction force: from mechanics to thermodynamics

Christian Ferrari, Christian Gruber

arxiv:0911.3342 v2 · 2009-11-17 · physics.class-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HH5I2JAS35MHMJX4TO7NUTLBOU}

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	2026-05-18T02:10:46.718428Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

39fa8d2412df587626fc9bbeda4d617538e0a398ddea08e7f3c26f8d77c3763b

Aliases

arxiv: 0911.3342 · arxiv_version: 0911.3342v2 · doi: 10.48550/arxiv.0911.3342 · pith_short_12: HH5I2JAS35MH · pith_short_16: HH5I2JAS35MHMJX4 · pith_short_8: HH5I2JAS

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/HH5I2JAS35MHMJX4TO7NUTLBOU \
  | 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: 39fa8d2412df587626fc9bbeda4d617538e0a398ddea08e7f3c26f8d77c3763b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b9d9e5862e6f5dafa7bd85173ea87886b8c2cf73e3c0cfffc39f5bfc76dadcf3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.class-ph",
    "submitted_at": "2009-11-17T15:57:32Z",
    "title_canon_sha256": "774bda06e000e64130af161ff2029243acc6caf0e02bb56f7db8f5d646a7e7a8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0911.3342",
    "kind": "arxiv",
    "version": 2
  }
}