loeb space
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2010 ◽  
Vol 15 (1) ◽  
pp. 21-24
Author(s):  
Chunhui Ma ◽  
Shenggang Li ◽  
Yanwei Shi
Keyword(s):  


2005 ◽  
Vol 05 (04) ◽  
pp. 487-533 ◽  
Author(s):  
NIGEL J. CUTLAND ◽  
H. JEROME KEISLER

In [14] nonstandard analysis was used to construct a (standard) global attractor for the 3D stochastic Navier–Stokes equations with general multiplicative noise, living on a Loeb space, using Sell's approach [26]. The attractor had somewhat ad hoc attracting and compactness properties. We strengthen this result by showing that the attractor has stronger properties making it a neo-attractor — a notion introduced here that arises naturally from the Keisler–Fajardo theory of neometric spaces [18]. To set this result in context we first survey the use of Loeb space and nonstandard techniques in the study of attractors, with special emphasis on results obtained for the Navier–Stokes equations both deterministic and stochastic, showing that such methods are well-suited to this enterprise.



1998 ◽  
Vol 63 (4) ◽  
pp. 1371-1392
Author(s):  
Renling Jin ◽  
Saharon Shelah

AbstractIn this paper we show that the compactness of a Loeb space depends on its cardinality, the nonstandard universe it belongs to and the underlying model of set theory we live in. In §1 we prove that Loeb spaces are compact under various assumptions, and in §2 we prove that Loeb spaces are not compact under various other assumptions. The results in §1 and §2 give a quite complete answer to a question of D.Ross in [9], [11] and [12].



1996 ◽  
Vol 2 (2) ◽  
pp. 189-198 ◽  
Author(s):  
Yeneng Sun

AbstractThe Loeb space construction in nonstandard analysis is applied to the theory of processes to reveal basic phenomena which cannot be treated using classical methods. An asymptotic interpretation of results established here shows that for a triangular array (or a sequence) of random variables, asymptotic uncorrelatedness or asymptotic pairwise independence is necessary and sufficient for the validity of appropriate versions of the law of large numbers. Our intrinsic characterization of almost sure pairwise independence leads to the equivalence of various multiplicative properties of random variables.



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