Froda's theorem: Difference between revisions

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-In [[mathematics]], '''Wilkie's theorem''' is a result by [[Alex Wilkie]] about the theory of [[ordered field]]s with an [[Exponential field|exponential function]], or equivalently about the geometric nature of exponential varieties.
-==Formulations==
-In terms of [[model theory]], Wilkie's theorem deals with the language ''L''<sub>exp</sub>&nbsp;=&nbsp;(+,−,·,<,0,1,''e''<sup>''x''</sup>), the language of [[ordered ring]]s with an exponential function ''e''<sup>''x''</sup>.  Suppose ''φ''(''x''<sub>1</sub>,...,''x''<sub>''m''</sub>) is a formula in this language, then Wilkie's theorem states that there is an integer ''n''&nbsp;≥&nbsp;''m'' and polynomials ''f''<sub>1</sub>,...,''f''<sub>''r''</sub>&nbsp;∈&nbsp;'''Z'''[''x''<sub>1</sub>,...,''x''<sub>''n''</sub>,''e''<sup>''x''<sub>1</sub></sup>,...,''e''<sup>''x''<sub>''n''</sub></sup>] such that ''φ''(''x''<sub>1</sub>,...,''x''<sub>''m''</sub>) is equivalent to the [[Well-formed formula#Predicate logic|existential formula]]
-:<math>\exists x_{m+1}\ldots\exists x_n \, f_1(x_1,\ldots,x_n,e^{x_1},\ldots,e^{x_n})=\cdots= f_r(x_1,\ldots,x_n,e^{x_1},\ldots,e^{x_n})=0.\,</math>
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-Thus, while this theory does not have full [[quantifier elimination]], formulae can be put in a particularly simple form.  This result proves that the theory of the structure '''R'''<sub>exp</sub>, that is the real ordered field with the [[exponential function]], is [[model complete]].<ref name="aw96">A.J. Wilkie, ''Model completeness results for expansions of the ordered field of real numbers by restricted pfaffian functions and the exponential functions'', J. Amer. Math. Soc. '''9''' (1996), pp. 1051–1094.</ref>
-In terms of [[Analytic geometry#Algebraic geometry|analytic geometry]], the theorem states that any [[definable set]] in the above language — in particular the complement of an exponential variety — is in fact a projection of an exponential variety.  An exponential variety over a field ''K'' is the set of points in ''K''<sup>''n''</sup> where a finite collection of [[exponential polynomial]]s simultaneously vanish.  Wilkie's theorem states that if we have any definable set in an ''L''<sub>exp</sub> structure '''K'''&nbsp;=&nbsp;(''K'',+,−,·,0,1,''e''<sup>''x''</sup>), say ''X''&nbsp;⊂&nbsp;''K''<sup>''m''</sup>, then there will be an exponential variety in some higher dimension ''K''<sup>''n''</sup> such that the projection of this variety down onto ''K''<sup>''m''</sup> will be precisely ''X''.
-==Gabrielov's theorem==
-The result can be considered as a variation of Gabrielov's theorem.  This earlier theorem, by Andrei Gabrielov, dealt with [[sub-analytic set]]s, or the language ''L''<sub>an</sub> of ordered rings with a function symbol for each proper [[analytic function]] on '''R'''<sup>''m''</sup> restricted to the closed unit cube [0,1]<sup>''m''</sup>.  Gabrielov's theorem states that any formula in this language is equivalent to an existential one, as above.<ref>A. Gabrielov, ''Projections of semi-analytic sets'', Functional Anal. Appl. '''2''' (1968), pp.282–291.</ref>  Hence the theory of the real ordered field with restricted analytic functions is model complete.
-==Intermediate results==
-Gabrielov's theorem applies to the real field with all restricted analytic functions adjoined, whereas Wilkie's theorem removes the need to restrict the function, but only allows one to add the exponential function.  As an intermediate result Wilkie asked when the complement of a sub-analytic set could be defined using the same analytic functions that described the original set.  It turns out the required functions are the [[pfaffian function]]s.<ref name="aw96"/>  In particular the theory of the real ordered field with restricted, totally defined pfaffian functions is model complete.<ref>A.J. Wilkie, ''A theorem of the complement and some new o-minimal structures'', Sel. Math. '''5''' (1999), pp.397&ndash;421.</ref>  Wilkie's approach for this latter result is somewhat different to his proof of Wilkie's theorem, and the result that allowed him to show that the Pfaffian structure is model complete is sometimes known as Wilkie's theorem of the complement.
-==References==
-{{Reflist}}
-[[Category:Model theory]]
-[[Category:Theorems in the foundations of mathematics]]

Froda's theorem: Difference between revisions

Revision as of 01:10, 13 February 2014

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