Model Theory and Differential Equations

这些研究项目解决微分域模型理论和实数域模型理论中的问题。 微分场的模型理论是一个吸引人的领域，它需要稳定性理论、微分代数和代数几何的思想的复杂混合。Buium和Hrushovski的工作表明，theseideas有重要的后果丢番图几何。 特别是，首席研究员将研究algebraicdifferential方程族的解集的模型论行为。 关于具有指数的真实的数域的模型论的这条研究路线预期集中于无穷远处微分方程的整体解与数学-指数级数域中的形式解之间的关系。模型论是逻辑的一个分支，它探索诸如真实的数以及它们的算术运算和序关系之类的数学结构，分析对象集合的基本规则或公理及其操作决定该集合的形状的程度。 模型论的方法和结果都是用可定义的集合和函数来表示的，当一个结构可以用该结构的语言用一阶逻辑公式来表示时，它就是可精确定义的。具有指数的真实的数域的模型论方法在证明指数簇和由它们定义的集合的几何学方面取得了巨大的成功。这项工作已经在渐近分析、控制理论、微局域分析和神经网络中得到应用。 微分场的模型理论在数论中有重要的应用。

These research projects address problems in the model theory ofdifferential fields and the model theory of the field of realnumbers with exponentiation. The model theory of differentialfields is a fascinating area requiring a sophisticated mixture ofideas from stability theory, differential algebra and algebraicgeometry. The work of Buium and Hrushovski has shown that theseideas have important consequences in Diophantine geometry. Inparticular, the principal investigator will study the modeltheoretic behavior of solution sets of families of algebraicdifferential equations. This line of research on the modeltheory of the field of real numbers with exponentiation isexpected to concentrate on the relationship between globalsolutions to differential equations at infinity and formalsolutions in the field of logarithmic-exponential series.Model theory is a branch of logic that explores mathematicalstructures such as the real numbers together with theirarithmetic operations and ordering relation, analyzing the degreeto which the basic rules or axioms for a collection of objectsand their operations determine the shape of that collection. Themethods and results of model theory are cast in terms ofdefinable sets and functions, where a construction is definableexactly when it can be expressed by first-order logical formulasin the language of the structure. Model theoretic methods for thefield of real numbers with exponentiation have been remarkablysuccessful in proving new results on the geometry of exponentialvarieties and sets defined from them. This work has already foundapplications in asymptotic analysis, control theory, microlocalanalysis, and neural networks. The model theory of differentialfields has had significant applications in number theory.