منابع مشابه
A consistency result on weak reflection
In this paper we study the notion of strong non-reflection, and its contrapositive weak reflection. We say θ strongly non-reflects at λ iff there is a function F : θ −→ λ such that for all α < θ with cf(α) = λ there is C club in α such that F 1 C is strictly increasing. We prove that it is consistent to have a cardinal θ such that strong non-reflection and weak reflection each hold on an unboun...
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In this paper we study the notion of strong non-reeection, and its contrapositive weak reeection. We say strongly non-reeects at ii there is a function F : ! such that for all < with cf() = there is C club in such that F C is strictly increasing. We prove that it is consistent to have a cardinal such that strong non-reeection and weak reeection each hold on an unbounded set of cardinals less th...
متن کاملOn the Weak Reflection Principle
The Weak Reflection Principle for ω2, or WRP(ω2), is the statement that every stationary subset of Pω1 (ω2) reflects to an uncountable ordinal in ω2. The Reflection Principle for ω2, or RP(ω2), is the statement that every stationary subset of Pω1 (ω2) reflects to an ordinal in ω2 with cofinality ω1. Let κ be a κ+-supercompact cardinal and assume 2κ = κ+. Then there exists a forcing poset P whic...
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We address the following issue: Suppose that we have taken a dataset consisting of a set of events. We do an analysis on this dataset, and obtain a result of interest. We then take the same dataset, and repeat the analysis, possibly with differences, to again obtain a result on the same matter of interest. How do we determine whether our two results are “consistent”? Let us first attempt to ens...
متن کاملWeak-shock Reflection Factors
Ernst Mach (1838-1916) was the first to discover an irregular reflection phenomenon of shock waves, as is well known in our community. In fact, this occurred in 1875-three years earlier than usually assumed in the literature [1]. However, it is correct that Mach gave the physical interpretation of this phenomenon in 1878 [2]. Since Mach's discovery of an irregular shock reflection pattern some ...
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ژورنال
عنوان ژورنال: Fundamenta Mathematicae
سال: 1995
ISSN: 0016-2736,1730-6329
DOI: 10.4064/fm-148-1-91-100