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The Complex Hyperbolic Geometry of the Moduli Space of Cubic Surfaces

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abstract

Recall that the moduli space of smooth (that is, stable) cubic curves is isomorphic to the quotient of the upper half plane by the group of fractional linear transformations with integer coefficients. We establish a similar result for stable cubic surfaces: the moduli space is biholomorphic to a quotient of the compex 4-ball by an explict arithmetic group generated by complex reflections. This identification gives interesting structural information on the moduli space and allows one to locate the points in complex hyperbolic 4-space corresponding to cubic surfaces with symmetry, e.g., the Fermat cubic surface. Related results, not quite as extensive, were announced in alg-geom/9709016.

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math.HO 1

years

2025 1

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CONDITIONAL 1

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Using Large Language Models to Study Mathematical Practice

math.HO · 2025-06-16 · conditional · novelty 6.0

An LLM-assisted corpus study finds that roughly 3% to 12% of 5,000 arXiv math papers contain clear or borderline appeals to mathematical explanation, with frequency varying by subfield.

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  • Using Large Language Models to Study Mathematical Practice math.HO · 2025-06-16 · conditional · none · ref 2 · internal anchor

    An LLM-assisted corpus study finds that roughly 3% to 12% of 5,000 arXiv math papers contain clear or borderline appeals to mathematical explanation, with frequency varying by subfield.