منابع مشابه
On an extremal problem of Garcia and Ross
We show the equivalence of two extremal problems on Hardy spaces, thus answering a question posed by Garcia and Ross. The proof uses a slight generalization of complex symmetric operators. Mathematics Subject Classification (2000): Primary 47A05, 47B35; Secondary 47B99.
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the central purpose of this study was to conduct a case study about the role of self monitoring in teacher’s use of motivational strategies. furthermore it focused on how these strategies affected students’ motivational behavior. although many studies have been done to investigate teachers’ motivational strategies use (cheng & d?rnyei, 2007; d?rnyei & csizer, 1998; green, 2001, guilloteaux & d?...
An extremal problem on crossing vectors
Article history: Received 9 October 2013 Available online xxxx
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A sequence a,< . . . of integers is called primitive if no a divides any other . (a 1 < . . . will always denote a primitive sequence .) It is easy to see that if a i < . . . < a,,, < n then max k = [(n + 1) /2] . The following question seems to be very much more difficult . Put f(n) =niax E 1) , a,, where the maximum is taken over all primitive sequences all of wliose terms are not exceeding n...
متن کاملOn an extremal problem for poset dimension
Let f(n) be the largest integer such that every poset on n elements has a 2-dimensional subposet on f(n) elements. What is the asymptotics of f(n)? It is easy to see that f(n) > n. We improve the best known upper bound and show f(n) = O(n). For higher dimensions, we show fd(n) = O ( n d d+1 ) , where fd(n) is the largest integer such that every poset on n elements has a d-dimensional subposet o...
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ژورنال
عنوان ژورنال: Operators and Matrices
سال: 2009
ISSN: 1846-3886
DOI: 10.7153/oam-03-31