Author

Peng Cui

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#artificial intelligence Preprint Oct 2026

What Makes Something Hard(er)? Explaining Question Difficulty in Natural Language

Difficulty is one of the most fundamental properties of a question: it determines whether the question can meaningfully discriminate between models of differing ability. Although a variety of methods can now estimate or predict difficulty automatically, they yield only a single descriptive number, with no account of th...

Peng Cui, Qiao-Yuan Zheng, R. Debelak et al. · 0 citations

#artificial intelligence Preprint Sep 2026

Do LLMs Exhibit Coherent Knowledge Structures in Mathematical Reasoning? A Perspective from Knowledge Space Theory

Human knowledge is inherently structured and interdependent: mastery of a concept requires prior mastery of its prerequisites, a principle formalized by Knowledge Space Theory (KST). While LLMs achieve strong performance on complex reasoning tasks, it remains unclear whether they exhibit coherent, human-like knowledge...

Peng Cui, Heejin Do, Mrinmaya Sachan · 0 citations