Pith Number

pith:CQHGVQJG

pith:2013:CQHGVQJGF62HK56Q4HYXGOKTL5

not attested not anchored not stored refs pending

Reflection off Surfaces of Revolution: a Teachers' primer to the Introduction of the Cross-section Concept

Luca Perotti, Marco Giliberti

arxiv:1303.0408 v1 · 2013-03-02 · physics.ed-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{CQHGVQJGF62HK56Q4HYXGOKTL5}

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	2026-05-18T03:31:56.182249Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

140e6ac1262fb47577d0e1f17339535f4bdaca4c851171b8b01c75683f2a7cb7

Aliases

arxiv: 1303.0408 · arxiv_version: 1303.0408v1 · doi: 10.48550/arxiv.1303.0408 · pith_short_12: CQHGVQJGF62H · pith_short_16: CQHGVQJGF62HK56Q · pith_short_8: CQHGVQJG

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/CQHGVQJGF62HK56Q4HYXGOKTL5 \
  | 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: 140e6ac1262fb47577d0e1f17339535f4bdaca4c851171b8b01c75683f2a7cb7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a606694baa37e56aa941aa60386218106375af98cb7a36a2b27e7934aeb5a139",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ed-ph",
    "submitted_at": "2013-03-02T17:56:43Z",
    "title_canon_sha256": "2e0af2aa074ba2aeb84af1c64723af4465a2af9576832e2a565ff15f720abe26"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1303.0408",
    "kind": "arxiv",
    "version": 1
  }
}