The Prague seminar on function spaces and Approximation theory

archive of lectures


2014


September 17


 A.Gogatishvili, T. Kopaliani


 
On the boundedness of strongly singular integral operators in variable Lebesgue spaces


Abstract
We obtain one variant of the  extrapolation theorem of Rubio de Fracia for variable exponent Lebesgue spaces.
As a consequence we obtain conditions guarantee boundedness of strongly singular integral operators,
singular integral operators with rough kernels, fractional maximal operators related to spherical means, Bochner-Riesz
operators in variable Lebesgue spaces.

 September 24

 
A.Gogatishvili,  T. Kopaliani

 Boundedness of the Stein’s spherical maximal function, singular integral operators, Riesz potential  and their commutators on generalized Morrey spaces

Abstract
We obtain extension of the extrapolation theorem of Rubio de Francia for weighted generalized Morrey space. As a
consequence we obtain conditions guarantee boundedness of many classical operators in harmonic analysis in weighted generalized
Morrey spaces.


October  1  

A. Gogatishv T. Kopaliani


 A priori estimate of solutions of  wave equation on variable Lebesgue spaces

 

October 8 


 U. Goginava 


Pointwise convergence of Marcinkiewicz-Fejer means of d-dimensional Vilenkin-Fourier series

 

October 10
 

U. Goginava

 On the convergence of multiple Walsh-Fourier series of functions of bounded generalized variation

2015


June 10


A.Gogatishvili


A new reduction principle for integral operators on
the semiaxis with general kernel, restricted on the
cone of quasi-concave functions in Lp-Lq setting


June 17


A.Gogatishvili ( joint work with T.Kopaliania and N.Samashvili)


The unconditional wavelet bases in  W^{k,p(.)}(R^n).



June 26
 

U. Goginava

Weak type inequality for maximal operator of
Marcinkiewicz-Fejer means of d-dimensional
Vilenkin-Fourier series


June 29
 

A.Aplakov


On the absolute convergence of the series of Fourier-Haar coefficients



A. Danelia


The exact estimates of the partial moduli of
smoothness of fractional order of the conjugate
functions of many variables in the functional
classes H(\varphy, T^n))



September 23

 A. Gogatishvili,  T. Kopaliani

Compactnes of Hardy-Volterra type operator in variable Lebesgue
spaces



September 30


U. Goginava

 Logarithmic summability of Fourier series


2016

January  27


T.Kopaliani, N.Samashvili, A. Gogatishvili

A wavelet characterization of local Hardy spaces


 
February 10

U. Goginava


Weak type inequality for maximal operator of
Marcinkiewicz-Fejer means of d-dimensional
Vilenkin-Fourier series

 
February 24

 G.Tephnadze


On the d-dimensional Vilenkin-Marcinkiewicz means on the Hardy spaces


May 4


A.Gogatishvili 
and T. Kopaliani

Desscription of the complex interpolation spaces between sobolev spaces with variable exponents ,


May 11


A. Gogatishvili and T. Kopaliani

A estimates for moduli of smoothness and their applications to the  embeddings of Sobolev and Besov type spaces


 May 18

U.Goginava

 Strong summability of two-dimensional Vilenkin Fourier series


June 22

 
U. Goginava

Strong  approximation by Marcinkiewicz means of two-dimentional Walsh Kachmarz Fourier series

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