Pith Number

pith:GQWZQ7UZ

pith:2015:GQWZQ7UZDIWJSSC4WNG2LDNRGM

not attested not anchored not stored refs pending

Double pendulum model for tennis stroke including a collision process

Sun-Hyun Youn

arxiv:1505.01916 v1 · 2015-05-08 · 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{GQWZQ7UZDIWJSSC4WNG2LDNRGM}

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	2026-05-18T01:25:55.344575Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

342d987e991a2c99485cb34da58db1331d7913112f980376568274f8f8db0670

Aliases

arxiv: 1505.01916 · arxiv_version: 1505.01916v1 · doi: 10.48550/arxiv.1505.01916 · pith_short_12: GQWZQ7UZDIWJ · pith_short_16: GQWZQ7UZDIWJSSC4 · pith_short_8: GQWZQ7UZ

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/GQWZQ7UZDIWJSSC4WNG2LDNRGM \
  | 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: 342d987e991a2c99485cb34da58db1331d7913112f980376568274f8f8db0670

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2da7275f29c14b9f1f7dccc7ba89f47f21f72fcd40fb92ba5526db960fe983da",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.class-ph",
    "submitted_at": "2015-05-08T02:46:57Z",
    "title_canon_sha256": "ed15ea398b044bd97f7908be145185049b16a52095a4406be0ffe458f8de7fdf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1505.01916",
    "kind": "arxiv",
    "version": 1
  }
}