On April 17, 2018,
Viktor ROMANYUK
had successfully defended Doctor Dissertation
"Methods and characteristics of linear and nonlinear approximation of classes of smooth functions".
Scientific adviser -
Doctor of Sciences, Professor
Anatoliy ROMANYUK .
Official opponents -
Doctor of Sciences, Professor
Serhiy VAKARCHUK,
Doctor of Sciences, Professor Oleh SKASKIV
and
Doctor of Sciences, Professor
Ihor SHEVCHUK
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On September 20, 2016 Viktoriya SHKAPA
had successfully defended Kandidate Dissertation
"Best approximations and greedy algorithms of
classes of
(ψ,β)-differentiable functions"
under supervision of
Doctor of Sciences Professor
Anatoliy ROMANYUK.
Official opponents were
Doctor of Sciences Professor
Petro ZADEREI
and Kandidate of Sciences Mykola NAZARENKO.
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On September 20, 2016 Irina MEREMELIA
had successfully defended Kandidate Dissertation
"Best
approximations
and
extremal
problems
of
classes
of
holomorphic
functions"
under supervision of
Doctor of Sciences
Viktor SAVCHUK.
Official opponents were
Doctor of Sciences Professor
Serhiy VAKARCHUK
and Kandidate of Sciences
Olena RADZIYEVSKA.
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On June 21, 2016
Stanislav CHAICHENKO
had successfully defended Doctor Dissertation
"Extremal Problems of Theory of Approximation of
Functions of Real and Complex Variables".
Scientific adviser -
Doctor of Sciences
Viktor SAVCHUK.
Official opponents -
Corresponding Member of NASU, Professor
Vitalii MOTORNYI
,
Doctor of Sciences, Professor Oleh SKASKIV and
Doctor of Sciences, Professor
Petro ZADEREI.
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On June 21, 2016 Volodimir BODENCHUK
had successfully defended Kandidate Dissertation
"Estimates of widths of classes of (ψ,β)-differentiable functions"
under supervision of
Doctor of Sciences
A.S.SERDYUK.
Official opponents were
Doctor of Sciences Professor
S.B.VAKARCHUK
and Kandidate of Sciences M.O.NAZARENKO.
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On January 19, 2016 Tetiana STEPANYUK
had successfully defended Kandidate Dissertation
"Approximative characteristics of classes of (ψ,β)-differentiable functions"
under supervision of
Doctor of Sciences
A.S.SERDYUK.
Official opponents were
Doctor of Sciences Professor
P.V.ZADEREI
and Kandidate of Sciences S.O.CHAICHENKO.
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On April 7, 2015 Uliana GRABOVA
had successfully defended Kandidate Dissertation
"Estimates of deviations of linear means of Fourier series on
the classes of
(ψ,β)-differentiable functions"
under supervision of
Doctor of Sciences
A.S.SERDYUK.
Official opponents were
Doctor of Sciences Professor
P.V.ZADEREI
and Kandidate of Sciences S.O.CHAICHENKO.
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On January 27, 2015 junior scientific worker
of the Department of
Theory of Functions Vitaliy MYRONYUK
had successfully defended Kandidate Dissertation
"Apptoximative characteristics of classes of functions of several variables"
under supervision of
Doctor of Sciences Professor
A.S.ROMANYUK.
Official opponents were
Doctor of Sciences Professor
S.B.VAKARCHUK
and Kandidate of Sciences M.O.NAZARENKO.
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On June 3, 2014
junior scientific worker
of the Department of
Theory of Functions Viktor VOYTOVICH
had successfully defended Kandidate Dissertation
"Approximation of classes of (ψ,β)-differentiable functions by interpolatory analogs of de la Valle Poussin sums"
under supervision of
Doctor of Sciences
A.S.SERDYUK.
Official opponents were
Doctor of Sciences Professor
S.B.VAKARCHUK
and Kandidate of Sciences S.O.CHAICHENKO.
Additional opponent was
Doctor of Sciences Professor P.V.ZADEREI.
|
On September 17, 2013 junior scientific worker
of the Department of
Theory of Functions Andriy MUSIYENKO
had successfully defended Kandidate Dissertation
"Inequalities of Lebesgue type for La Vallee Poussin sums of classes of
(ψ,β)-differentiable functions"
under supervision of
Doctor of Sciences
A.S.SERDYUK.
Official opponents were
Doctor of Sciences Professor P.V.ZADEREI
and Kandidate of Sciences S.O.CHAICHENKO.
|
On January 22, 2013 junior scientific worker
of the Department of
Theory of Functions Katerina SOLICH
had successfully defended Kandidate Dissertation
"Bilinear approximations of classes of periodic functions of several variables"
under supervision of
Doctor of Sciences
A.S.ROMANYUK.
Official opponents were
Doctor of Sciences Professor S.B.VAKARCHUK
and Doctor of Sciences Professor P.V.ZADEREI.
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On March 13, 2012 senior scientific worker of the Department of
Theory of Functions Viktor SAVCHUK
had successfully defended Doctor Dissertation
"Extremal problems of theory of approximation of holomorphic functions".
Scientific advisers -
Corresponding Member of NAS of Ukraine professor
Alexander STEPANETS
and Academician of NAS of Ukraine professor
Anatoliy SAMOILENKO.
Official opponents were
Corresponding Member of NAS of Ukraine professor
Miroslav GORBACHUK,
professor Viktor BUSLAYEV and
professor
Serhiy VAKARCHUK.
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On April 5, 2011 junior scientific worker
of the Department of
Theory of Functions Sergiy YANCHENKO
had successfully defended Kandidate Dissertation
"Investigation of approximative characteristics
of classes of functions of several variables"
under supervision of
Doctor of Sciences
A.S.ROMANYUK.
Official opponents were
Doctor of Sciences S.B.VAKARCHUK
and Kandidate of Sciences P.A.POPOV.
|
On June 1, 2010 junior scientific worker
of the Department of
Theory of Functions Sergiy VOITENKO
had successfully defended Kandidate Dissertation
"Investigation of approximative characteristics
of classes of functions of one and several variables"
under supervision of
Corresponding Member of NASU Prof.
Alexander
STEPANETS and
Doctor of Sciences
A.S.ROMANYUK.
Official opponents were
Doctor of Sciences V.O.KOFANOV
and Kandidate of Sciences P.A.POPOV.
|
At February 25, 2009 Presidium of the National Academy of
Sciences of Ukraine
had awarded
scientific workers of the Department of
Theory of Functions
Sergiy STASYUK,
Igor SOKOLENKO and
Andriy SHIDLICH
by annual National Academy of Sciences of Ukraine Prize for young scientists
for work "Investigation of
approximative properties of classes of functions of one and several variables"
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Collection of papers "Theory
of approximation of functions and related problems"
is published as Volume 5, No.1 of "Collection of works of the Institute of
Mathematics of Ukainian Academy of Sciences".
Collection is devoted to the memory of
O.I.STEPANETS.
Editorial board -
A.S.ROMANYUK,
A.S.SERDYUK,
I.V.SOKOLENKO.
Summary and content of the book may be found
here.
|
On February 6, 2008 Presidium of the National
Academy of Sciences of Ukraine had confirmed
Doctor of Sciences
Anatoly ROMANYUK
as the Head of the Department
of the Theory of Functions of the
Institute of Mathematics of NASU.
|
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Collection of papers "Problems of the theory
of approximation of functions and related problems"
is published as Volume 4, No.1 of "Collection of works of the Institute of
Mathematics of Ukainian Academy of Sciences".
Editorial board - Corresponding Member of NASU
A.I.STEPANETS,
A.S.ROMANYUK,
I.V.SOKOLENKO.
Summary and content of the book may be found
here.
|
By decree from December 4, 2007 President of Ukraine Viktor Yushchenko
had awarded
scientific workers of the Department of
Theory of Functions
Sergiy STASYUK,
Igor SOKOLENKO and
Andriy SHIDLICH
by annual President of Ukraine Prize for young scientists
for work "Investigation of
approximative characteristics of functional classes"
|
Presidium of the National Academy of Sciences
of Ukraine on its meeting on February 28, 2007
had awarded by M.M.Krylov Prize
Corresponding Member of NAS
of Ukraine
MAKAROV Wolodymyr Leonidovich,
Corresponding Member of NAS
of Ukraine
STEPANETS Olexander Ivanovich
and
Professor Fahraddin ABDULLAYEV
for collection of
papers
"Modern methods of theory of
approximation and interpolation".
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On October 31, 2006 postgraduate
of the Department of the Theory
of Functions Oksana FEDUNYK
had successfully defended Kandidate Dissertation
"Linear and orthoproject
widths of classes of periodic functions
of several variables"
under supervision of
Doctor of Sciences
A.S.ROMANYUK.
Official opponents were
Doctor of Sciences V.N.KONOVALOV
and Kandidate of Sciences N.A.NAZARENKO.
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On February 28, 2006 senior scientific worker
of the Department of
Theory of Functions Anatoly SERDYUK
had successfully defended Doctor Dissertation
"Extremal problems of approximation
theory on classes of infinitely differentiable periodic functions"
.
Scientific advisor -
Corresponding Member of NASU Prof.
Alexander
STEPANETS.
Official opponents -
Corresponding Member of NASU Prof.
Miroslav
GORBACHUK,
Prof. Anatoly LIGUN
and Prof.
Mayor TIMAN.
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New collection of papers "Problems of the theory
of approximation of functions and related problems"
is preparing for publication.
Editorial board - Corresponding Member of NASU
A.I.STEPANETS,
A.S.ROMANYUK,
A.S.SERDYUK, S.A.STASYUK.
Deadline for submission of articles is
October 1, 2005. Papers should be submitted
to the Department of the Theory of Functions
of the Institute of
Mathematics of Ukainian Academy of Sciences
or by e-mail to stasyuk@imath.kiev.ua
.
Example for preparation of articles may be found
here.
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On May 31, 2005 junior scientific worker
of the Department of
Theory of Functions Igor SOKOLENKO
had successfully defended Kandidate Dissertation
"Approximation of  -integrals of
functions given on whole real axis"
under supervision of
Corresponding Member of NASU Prof.
Alexander
STEPANETS.
Official opponents were
Prof. Peter ZADEREY
and Prof.
Wolodymir RUKASOV.
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Collection of papers "Problems of the theory
of approximation of functions and related problems"
is published as Volume 1, No.1 of "Collection of works of the Institute of
Mathematics of Ukainian Academy of Sciences".
Editorial board - Corresponding Member of NASU
A.I.STEPANETS,
A.S.ROMANYUK,
A.S.SERDYUK, S.A.STASYUK.
Summary and content of the book may be found
here.
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On June 1, 2004 junior scientific worker
of the Department of
Theory of Functions Andriy SHIDLICH
had successfully defended Kandidate Dissertation
"Linear methods of summation of series in spaces
 "
under supervision of
Corresponding Member of NASU Prof.
Alexander
STEPANETS.
Official opponents were
Prof. Sergiy VAKARCHUK
and Prof. Wolodymir RUKASOV.
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