Pith Number

pith:KJ7PZACN

pith:2005:KJ7PZACNYNTSAHMIKR22ZABVAR

not attested not anchored not stored refs pending

Undecidable classical properties of observers

Sven Aerts

arxiv:quant-ph/0507001 v1 · 2005-06-30 · quant-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{KJ7PZACNYNTSAHMIKR22ZABVAR}

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	2026-05-18T01:37:57.696685Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

527efc804dc367201d885475ac803504753609873183f333fb2667773a3be035

Aliases

arxiv: quant-ph/0507001 · arxiv_version: quant-ph/0507001v1 · doi: 10.48550/arxiv.quant-ph/0507001 · pith_short_12: KJ7PZACNYNTS · pith_short_16: KJ7PZACNYNTSAHMI · pith_short_8: KJ7PZACN

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/KJ7PZACNYNTSAHMIKR22ZABVAR \
  | 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: 527efc804dc367201d885475ac803504753609873183f333fb2667773a3be035

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9133c9d01b50bc8d72cfd44fd6e3e2f31ab6d7f50a6b01fa8756f18e96797620",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "quant-ph",
    "submitted_at": "2005-06-30T22:50:52Z",
    "title_canon_sha256": "df021d075a524c0d0bc8209274d977ebb9522835bf5d5f9aea1c180072b2e5ea"
  },
  "schema_version": "1.0",
  "source": {
    "id": "quant-ph/0507001",
    "kind": "arxiv",
    "version": 1
  }
}