Pith Number

pith:CXWQPTRB

pith:2016:CXWQPTRBT7IL3YSQ4TLT5YKRA4

not attested not anchored not stored refs pending

Can Free-Response Questions Be Approximated by Multiple-Choice Equivalents?

Chandralekha Singh, Shih-Yin Lin

arxiv:1609.00018 v1 · 2016-02-20 · 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{CXWQPTRBT7IL3YSQ4TLT5YKRA4}

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	2026-05-18T01:06:28.223561Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

15ed07ce219fd0bde250e4d73ee151073599bad587ce52b8fdf6dea6c030b791

Aliases

arxiv: 1609.00018 · arxiv_version: 1609.00018v1 · doi: 10.48550/arxiv.1609.00018 · pith_short_12: CXWQPTRBT7IL · pith_short_16: CXWQPTRBT7IL3YSQ · pith_short_8: CXWQPTRB

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/CXWQPTRBT7IL3YSQ4TLT5YKRA4 \
  | 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: 15ed07ce219fd0bde250e4d73ee151073599bad587ce52b8fdf6dea6c030b791

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "786d48e4495dac2f134215030b353d4169a913e697c1232507aaacd71649daae",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ed-ph",
    "submitted_at": "2016-02-20T10:46:48Z",
    "title_canon_sha256": "902fed7fa8e33ee94ee542f244e023e11e6dd317be3fe05119a5898394d873d7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1609.00018",
    "kind": "arxiv",
    "version": 1
  }
}