Submission date: 12 June 2020

Abstract:

Suppose that Ω is a complex lattice that is closed under complex conjugation and that I is a small real interval, and that D is a disc in ℂ. Then the restriction ℘|_D is definable in the structure (ℝ̄,℘|_I) if and only if the lattice Ω has complex multiplication. This characterises lattices with complex multiplication in terms of definability.

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Full text arXiv 2006.07437: pdf, ps.