Noetherian varieties in definably complete structures

Logic and Analysis 1 (3-4):187-204 (2008)

Abstract
We prove that the zero-set of a C ∞ function belonging to a noetherian differential ring M can be written as a finite union of C ∞ manifolds which are definable by functions from the same ring. These manifolds can be taken to be connected under the additional assumption that every zero-dimensional regular zero-set of functions in M consists of finitely many points. These results hold not only for C ∞ functions over the reals, but more generally for definable C ∞ functions in a definably complete expansion of an ordered field. The class of definably complete expansions of ordered fields, whose basic properties are discussed in this paper, expands the class of real closed fields and includes o-minimal expansions of ordered fields. Finally, we provide examples of noetherian differential rings of C ∞ functions over the reals, containing non-analytic functions
Keywords Noetherian varieties  Definable completeness  o-Minimality  Quasi-analytic functions
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DOI 10.1007/s11813-008-0007-z
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Saturated Model Theory.Gerald E. Sacks - 1972 - Reading, Mass., W. A. Benjamin.

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