Pith Number

pith:XFY6I7Q2

pith:1994:XFY6I7Q2TLB2MARVCDFF3YZEHU

not attested not anchored not stored refs pending

The complexity of approximating PSPACE-Complete problems for hierarchical specifications

Harry B. Hunt III, Madhav V. Marathe, S. S. Ravi

arxiv:math/9409225 v1 · 1994-09-21 · math.CO · 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{XFY6I7Q2TLB2MARVCDFF3YZEHU}

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	2026-05-18T01:05:51.062046Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b971e47e1a9ac3a6023510ca5de3243d303c77a307574e7e4468ddddb9307765

Aliases

arxiv: math/9409225 · arxiv_version: math/9409225v1 · doi: 10.48550/arxiv.math/9409225 · pith_short_12: XFY6I7Q2TLB2 · pith_short_16: XFY6I7Q2TLB2MARV · pith_short_8: XFY6I7Q2

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/XFY6I7Q2TLB2MARVCDFF3YZEHU \
  | 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: b971e47e1a9ac3a6023510ca5de3243d303c77a307574e7e4468ddddb9307765

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c56036d2b0bea4d39fecc176ace952b581504b1e0a6ad50655201bf47cb4fe37",
    "cross_cats_sorted": [
      "cs.CC"
    ],
    "license": "",
    "primary_cat": "math.CO",
    "submitted_at": "1994-09-21T00:00:00Z",
    "title_canon_sha256": "e3d40cef33664967f760525af86948c52a64ac2f374819ac201f288dfdaff8d8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/9409225",
    "kind": "arxiv",
    "version": 1
  }
}