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Xinyi Shang

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#artificial intelligence Preprint Sep 2026

Magenta: Closing the Loop Between Mathematical Reasoning and Lean Verification

This paper introduces Magenta, a training-free agentic pipeline that, given only a natural-language problem, produces an answer, expresses it as a Lean 4 statement, and constructs a machine-checked proof, which achieves 100% accuracy across all evaluated olympiad benchmarks.

Joshua Ong Jun Leang, Hao-Nan Li, Zheng-Yang Zhao et al. · 0 citations
Preprint Aug 2026

DARTree: Speculative Diffusion Decoding with Autoregressive Draft Trees

DARTree is introduced, a training-free speculative decoding method that extends a pretrained AR correction head from chains to trees, and achieves the highest average acceptance length and speedup in all four model--temperature configurations.

Tian-Yi Li, Yaxin Luo, Xin-Yi Shang et al. · 5 citations · ⚡1

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