Pith Number

pith:QWZOFNBG

pith:2018:QWZOFNBGDJVVC7SGSTFWDACUBQ

not attested not anchored not stored refs pending

The magnetic permeability in Fresnel's equation

Hans Olaf H{\aa}genvik, Johannes Skaar

arxiv:1812.05466 v1 · 2018-12-13 · physics.optics

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QWZOFNBGDJVVC7SGSTFWDACUBQ}

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	2026-05-17T23:58:20.159922Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

85b2e2b4261a6b517e4694cb6180540c3794d83ccf9d96188c3a0d4b2268f346

Aliases

arxiv: 1812.05466 · arxiv_version: 1812.05466v1 · doi: 10.48550/arxiv.1812.05466 · pith_short_12: QWZOFNBGDJVV · pith_short_16: QWZOFNBGDJVVC7SG · pith_short_8: QWZOFNBG

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/QWZOFNBGDJVVC7SGSTFWDACUBQ \
  | 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: 85b2e2b4261a6b517e4694cb6180540c3794d83ccf9d96188c3a0d4b2268f346

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0a2dec2525df253cc38f19ddbea9a2ab676b82dc9d581382b9de02d2830c3dee",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2018-12-13T14:56:59Z",
    "title_canon_sha256": "22d1094d88d96b6622dbe4c35f7c284f0bf2071f7d391cc81bab79be060b2ea4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1812.05466",
    "kind": "arxiv",
    "version": 1
  }
}