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ON STRONG LIFTINGS ON PROJECTIVE LIMITS

机译:关于强制极限的严格提升

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The main problem investigated in this paper is the following. Assume that we are given a convergent projective system of topological measure spaces ordered by ordinals. When does there exist a consistent system of liftings (densities, linear liftings) on the projective system converging to a lifting (density, linear lifting) on the limit space. We look mainly for strong or strong completion Baire liftings. We reduce the problem to the question about the existence of strong liftings being inverse images of other strong liftings under measure preserving mappings (Proposition 2.4) and then we adapt a condition applied earlier by A. and C. Ionescu Tulcea [14] to get a strong lifting for an arbitrary measure on a product space (Theorem 2.7). In this way we get some results (see Theorems 2.7, 5,3, 5.7, 6.4 and 6.5) extending the well known achievements of A. and C, Ionescu Tulcea [14] and Fremlin [9]. The application of projective limits allows us to carry over results obtained earlier only for product spaces (see e.g. [23], [18], [19], [20], [21]) to more general classes of topological probability spaces. In particular, we can extend the class of spaces for which there is a positive answer to a problem of X Kupka [17] concerning the permanence of the strong lifting property under the formation of products (see Theorem 6.5).
机译:本文研究的主要问题如下。假设我们得到了一个由序数排序的拓扑测度空间的收敛投影系统。何时在投影系统上存在一致的提升系统(密度,线性提升),最后收敛到极限空间上的提升系统(密度,线性提升)。我们主要寻找强劲完成的Baire起重机。我们将问题简化为存在强提升是在保持度量的映射下其他强提升的逆像的问题(命题2.4),然后我们采用A.和C. Ionescu Tulcea [14]之前应用的条件得到一个对产品空间进行任意度量的强提升(定理2.7)。这样,我们得到了一些结果(见定理2.7、5、3、5.7、6.4和6.5),扩展了A.和C,Ionescu Tulcea [14]和Fremlin [9]的知名成果。射影极限的应用使我们可以将仅对乘积空间(例如参见[23],[18],[19],[20],[21])获得的较早结果保留到更广泛的拓扑概率空间类别中。尤其是,我们可以扩展对于X Kupka [17]问题具有肯定答案的空间类别,该问题涉及产品形成下强提升性的持久性(见定理6.5)。

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