Pith Number

pith:ERUBIIKC

pith:2026:ERUBIIKC47NIQXK2ONAXU4OITB

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Language Acquisition Device in Large Language Models

Masato Mita, Ryo Yoshida, Taiga Someya, Yohei Oseki

Pre-pretraining LLMs on MP-STRUCT achieves token efficiency on par with strong baselines while adding resistance to implausible languages.

arxiv:2605.16758 v1 · 2026-05-16 · cs.CL

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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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.

Claims

C1strongest claim

A brief 500-step PPT with MP-STRUCT matches strong formal-language baselines in token efficiency while additionally imparting a human-like resistance to structurally implausible languages (e.g., REVERSE).

C2weakest assumption

That the structural properties encoded in MP-STRUCT (hierarchical composition, feature-based dependencies, long-distance displacement) successfully instantiate the innate constraints of the LAD hypothesis and transfer to improved natural-language behavior in LLMs.

C3one line summary

Pre-pretraining on MP-STRUCT matches k-Shuffle Dyck baselines in efficiency while adding human-like resistance to implausible languages and challenges the need for C-RASP definability in effective PPT languages.

References

109 extracted · 109 resolved · 0 Pith anchors

[1] Noam Chomsky , abstract =. On. Information and Control , volume =. 1959 , issn =. doi:https://doi.org/10.1016/S0019-9958(59)90362-6 , url = 1959 · doi:10.1016/s0019-9958(59)90362-6

[2] The Minimalist Program , author=. 1995 , publisher= 1995

[3] Step by Step: Essays on Minimalist Syntax in Honor of Howard Lasnik , editor =

[4] Derivation by Phase , ISBN = 2001 · doi:10.7551/mitpress/4056.003.0004

[5] Marks, Handbook of Fourier analysis & its ap- plications 2004 · doi:10.1093/oso/9780195171976.003.0004

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-20T00:03:20.251045Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2468142142e7da885d5a73417a71c8986260f8de53dc22d3a36340d384292122

Aliases

arxiv: 2605.16758 · arxiv_version: 2605.16758v1 · doi: 10.48550/arxiv.2605.16758 · pith_short_12: ERUBIIKC47NI · pith_short_16: ERUBIIKC47NIQXK2 · pith_short_8: ERUBIIKC

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/ERUBIIKC47NIQXK2ONAXU4OITB \
  | 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: 2468142142e7da885d5a73417a71c8986260f8de53dc22d3a36340d384292122

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "81e391107dbb63958655a5e6b6c50d0f39629bf2c848790de10e7cf2d2fde2ff",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2026-05-16T02:13:32Z",
    "title_canon_sha256": "c24045332153d795b33835574fedd17752258a19b44f53d7c0905091e6fbe890"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.16758",
    "kind": "arxiv",
    "version": 1
  }
}