Abstract
We obtain estimates for L p -norms of simple partial fractions in terms of their L r -norms on bounded and unbounded segments of the real axis for various p > 1 and r > 1 (S. M. Nikolskii type inequalities). We adduce examples and remarks concerning sharpness of the inequalities and area of their application.
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References
Protasov, V.Yu. “Approximations by Simple Partial Fractions and the Hilbert Transform,” Izv. Math. 73, No. 2, 333–349 (2009).
Danchenko, V.I. “Estimates of the Distances from the Poles of Logarithmic Derivatives of Polynomials to Straight Lines and Circles,” Russian Acad. Sci. Sb. Math. 82, No. 2, 425–440 (1995).
Danchenko, V.I. “Convergence of Simple Partial Fractions in Lp(R),” Sb. Math. 201, Nos. 7–8, 985–997 (2010).
Kayumov, I.R. “Integral Bounds for Simple Partial Fractions,” Russian Mathematics (Iz. VUZ) 56(4), 27–37 (2012).
Kayumov I.R. “Convergence of Series of Simple Partial Fractions in L p(R),” Sb.Math. 202, No. 10, 1493–1504 (2011).
Kayumov, I.R. “A Necessary Condition for the Convergence of Simple Partial Fractions in L p(R),” Mat. Zametki 92, No. 1, 149–152 (2012).
Kayumova, A.V. “The Convergence of Series of Simple Fractions in L p(R),” Uchen. Zap. Kazansk. Univ. Ser. Fiz.-Mat. Nauki 154, No. 1, 208–213 (2012).
Timan, A.F. Theory of Approximation of Functions of a Real Variable (Fizmatgiz, Moscow, 1960) [in Russian].
Bari, N.K. “A Generalization of Inequalities of S. N. Bernstein and A. A. Markov,” Izvestiya Akad. Nauk SSSR. Ser.Mat. 18, 159–176 (1954).
Nikolskii, S.M. “Inequalities for Entire Functions of Finite Degree and Their Application in the Theory of Differentiable Functions of Several Variables,” Trudy Mat. Inst. Steklov 38, 244–278 (1951).
Nikolskii, S.M. Approximation of Functions of Several Variables and Embedding Theorems (Nauka, Moscow, 1977) [in Russian].
Danchenko, V.I. “Estimates for the Derivatives of Simplest Fractions and Other Problems,” Matem. Sborn. 197, Nos. 3–4, 505–524 (2006).
Macintyre A.J. and Fuchs, W.H.J. “Inequalities for the Logarithmic Derivatives of a Polynomial,” J. London Math. Soc. 15(2), 162–168 (1940).
Rusak, V.N. Rational Functions as Approximation Apparatus (Beloruss. Gos. Univ., Minsk, 1979) [in Russian].
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Original Russian Text © V.I. Danchenko, A.E. Dodonov, 2014, published in Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika, 2014, No. 6, pp. 9–19.
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Danchenko, V.I., Dodonov, A.E. Estimates for L p -norms of simple partial fractions. Russ Math. 58, 6–15 (2014). https://doi.org/10.3103/S1066369X14060024
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DOI: https://doi.org/10.3103/S1066369X14060024