Universally defining Z in Q with 10 quantifiers

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Journal of the London Mathematical Society - ISSN 0024-6107-109:2 (2024) p. 1-18
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Universally defining finitely generated subrings of global fields

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Documenta Mathematica: Journal der Deutschen Mathematiker-Vereinigung - ISSN 1431-0643-26 (2021) p. 1851-1869
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