Jackson's inequality

Known as: Jackson inequality, Akhiezer-Krein-Favard theorem, Akhiezer–Krein–Favard theorem

In approximation theory, Jackson's inequality is an inequality bounding the value of function's best approximation by algebraic or trigonometric…

Papers overview

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2015

We study, beyond the well-known Akhiezer-Polovin model, plasma electrostatic wave and unmagnetized electron beam.Our…

2014

We introduce a notion of Krein C*-module over a C*-algebra and more generally over a Krein C*-algebra. Some properties of Krein C…

2012

We calculate the Casimir energy and entropy for two perfect metal spheres in the large and short separation limit. We obtain…

2011

Nowadays, modern laser systems reach intensities of more than 10 W/cm. In this intensity regime, a relativistic description of…

2011

C*-categories are essentially norm-closed ∗-categories of bounded linear operators between Hilbert spaces. The purpose of this…

2010

En France, entre 1941 et 1942, un premier Plan comptable est concu en pleine periode de l'occupation allemande. A la Liberation…

2004

AbstractWe consider a 2π-periodic function f continuous on $$\mathbb{R}$$ and changing its sign at 2s points yi ∈ [−π, π). For…

2003

It was proved by Huckleberry that the Akhiezer-Gindikin domain is included in the “Iwasawa domain” using complex analysis. We…

1999

1990

The asymptotic behavior of the ratioEn(f)/Ω (f), π/n) is studied for individual functions f∃C in the sense of upper and lower…