Pith Number

pith:IUOQTP24

pith:2009:IUOQTP24YWS63GHI2VBAQFGIQJ

not attested not anchored not stored refs pending

Inapproximability of maximal strip recovery

Minghui Jiang

arxiv:0912.4935 v4 · 2009-12-25 · cs.CC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IUOQTP24YWS63GHI2VBAQFGIQJ}

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	2026-05-18T02:10:13.754830Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

451d09bf5cc5a5ed98e8d5420814c882647ddad295bb3239330e5749b5094f25

Aliases

arxiv: 0912.4935 · arxiv_version: 0912.4935v4 · doi: 10.48550/arxiv.0912.4935 · pith_short_12: IUOQTP24YWS6 · pith_short_16: IUOQTP24YWS63GHI · pith_short_8: IUOQTP24

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/IUOQTP24YWS63GHI2VBAQFGIQJ \
  | 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: 451d09bf5cc5a5ed98e8d5420814c882647ddad295bb3239330e5749b5094f25

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8fe0a3ddd543ec9fc8cab4921ee84cc933bffd4af2c019ce275b45842e014085",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2009-12-25T03:25:15Z",
    "title_canon_sha256": "36b9ea36a2a10e13057e3f2442e54af8b30d25a79fcfba64dc512f34cd3d7566"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.4935",
    "kind": "arxiv",
    "version": 4
  }
}