On some open problems of approximation theory
نویسندگان
چکیده
منابع مشابه
An essay on some problems of approximation theory ∗ †
Several questions of approximation theory are discussed: 1) can one approximate stably in L ∞ norm f ′ given approximation f δ , f δ −f L ∞ < δ, of an unknown smooth function f (x), such that f ′ (x) L ∞ ≤ m 1 ? 2) can one approximate an arbitrary f ∈ L 2 (D), D ⊂ R n , n ≥ 3, is a bounded domain, by linear combinations of the products u 1 u 2 , where u m ∈ N (L m), m = 1, 2, L m is a formal li...
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ژورنال
عنوان ژورنال: Journal of Approximation Theory
سال: 1980
ISSN: 0021-9045
DOI: 10.1016/0021-9045(80)90138-0