Pith Number

pith:HJFPU5Q4

pith:2026:HJFPU5Q4SG2VBW35UTSH65QHY2

not attested not anchored not stored refs pending

Model Merging in the Essential Subspace

Lei Qi, Longhua Li, Qi Tian, Xin Geng

arxiv:2602.20208 v2 · 2026-02-23 · cs.LG · cs.AI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HJFPU5Q4SG2VBW35UTSH65QHY2}

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	2026-06-23T02:12:47.129252Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3a4afa761c91b550db7da4e47f7607c6982d6f7270a9b927bcb632270fabdf86

Aliases

arxiv: 2602.20208 · arxiv_version: 2602.20208v2 · doi: 10.48550/arxiv.2602.20208 · pith_short_12: HJFPU5Q4SG2V · pith_short_16: HJFPU5Q4SG2VBW35 · pith_short_8: HJFPU5Q4

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/HJFPU5Q4SG2VBW35UTSH65QHY2 \
  | 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: 3a4afa761c91b550db7da4e47f7607c6982d6f7270a9b927bcb632270fabdf86

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e39a81c9bdb89ff5d3b81df1124abca7a73af144999732d9fadd0a19d00259b6",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2026-02-23T00:33:38Z",
    "title_canon_sha256": "d5c41c5b7f49fd21479de63cbce5629e80e3bd5f4920ad5847b03ef98cd5a46f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2602.20208",
    "kind": "arxiv",
    "version": 2
  }
}