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Reproducing_kernel_Hilbert_spaces-print_book
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In this thesis we make a survey of the theory of reproducting kernel hilbert spaces associated with positive definite kernels and we illustrate their applications for interpolation problems of nevanlinna-Pick type.
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REPRODUCING KERNEL HILBERT SPACES
a thesis
submitted to the department of mathematics
and the institute of engineering and science
of bilkent university
in partial fulfillment of the requirements
for the degree of
master of science
By
Baver Okutmu¸stur
August, 2005
I certify that I have read this thesis and that in my opinion it is fully adequate,
in scope and in quality, as a thesis for the degree of Master of Science.
Assist. Prof. Dr. Aurelian Gheondea (Supervisor)
I certify that I have read this thesis and that in my opinion it is fully adequate,
in scope and in quality, as a thesis for the degree of Master of Science.
Prof. Dr. Mefharet Kocatepe
I certify that I have read this thesis and that in my opinion it is fully adequate,
in scope and in quality, as a thesis for the degree of Master of Science.
Assoc. Prof. Dr. H. Turgay Kaptano˘glu
Approved for the Institute of Engineering and Science:
Prof. Dr. Mehmet B. Baray
Director of the Institute Engineering and Science
ii
ABSTRACT
REPRODUCING KERNEL HILBERT SPACES
Baver Okutmu¸stur
M.S. in Mathematics
Supervisor: Assist. Prof. Dr. Aurelian Gheondea
August, 2005
In this thesis we make a survey of the theory of reproducing kernel Hilbert spaces
associated with positive definite kernels and we illustrate their applications for in-
terpolation problems of Nevanlinna-Pick type. Firstly we focus on the properties
of reproducing kernel Hilbert spaces, generation of new spaces and relationships
between their kernels and some theorems on extensions of functions and kernels.
One of the most useful reproducing kernel Hilbert spaces, the Bergman space, is
studied in details in chapter 3. After giving a brief definition of Hardy spaces, we
dedicate the last part for applications of interpolation problems of Nevanlinna-
Pick type with three main theorems: interpolation with a finite number of points,
interpolation with an infinite number of points and interpolation with points on
the boundary. Finally we include an Appendix that contains a brief recall of the
main results from functional analysis and operator theory.
Keywords: Reproducing kernel, Reproducing kernel Hilbert spaces, Bergman
spaces, Hardy spaces, Interpolation, Riesz theorem.
iii
¨
OZET
DO
˘
GURAN C¸ EK
˙
IRDEKL
˙
I H
˙
ILBERT UZAYLARI
Baver Okutmu¸stur
Matematik, Y¨uksek Lisans
Tez Y¨oneticisi: Yrd. Do¸c. Dr. Aurelian Gheondea
A˘gustos, 2005
Bu tezde, do˘guran ¸cekirdekli Hilbert uzayları teorisini pozitif tanımlı
¸cekirdekler ile beraber inceledik ve bunun uygulamalarını Nevallina-Pick inter-
polasyon problemleri ¨uzerinde ¨ornekledik.
¨
Oncelikle, do˘guran ¸cekirdekli Hilbert
uzaylarının ¨ozelliklerini, ¨uretilen yeni uzaylar ve onların ¸cekirdekleri arasındaki
ili¸skileri ve geni¸sletilen ¸ce¸sitli fonksiyon ve ¸cekirdeklerle ilgili bazı teoremleri
inceledik. Sık¸ca kullanılan do˘guran ¸cekirdekli Hilbert uzaylarından biri olan
Bergman uzayı 3. kısımda detaylarıyla i¸slendi. Hardy uzayının kısa bir
tanımıyla ba¸sladı˘gımız son kısım, Nevallina-Pick interpolasyon problemlerinin
uygulamalarını i¸ceren ¨u¸c ana teorem ile son buldu. Bunlar: sınırlı sayıda nokta
ile interpolasyon, sınırsız sayıda nokta ile interpolasyon ve sınır noktalarında in-
terpolasyon. Son olarak Appendix kısmı bu tezde sık¸ca kullandı˜gımız fonksiyonel
analiz ve operator teori ile ilgili temel esasların kısa bir ¨ozetine ayrıldı.
Anahtar s¨ozc¨ukler: Do˘guran ¸cekirdekler, Do˘guran ¸cekirdekli Hilbert uzayları,
Bergman uzayları, Hardy uzayları,
˙
Interpolasyon, Riesz teoremi.
iv
Acknowledgement
I would like to express my sincere gratitude to my supervisor Assoc. Prof.
Aurelian Gheondea, firstly for introducing me to this area of analysis, for his
excellent guidance, valuable suggestions, encouragement and infinite patience. I
am glad to have a chance to study with this great person who is a role model as
a supervisor and a mathematician.
My sincere thanks to Prof. Dr. Mefharet Kocatepe for her interest and useful
comments.
I also need to express my gratitude to Assoc. Prof. H. Turgay Kaptano˜glu
for providing me necessary documents for this study.
I am grateful to Aslı Pekcan and Murat Altunbulak who helped me about
Latex. Special thanks to Aslı for reading my thesis, for her advices, corrections
and helps.
Beside, I would like to thank Serdar, Hikmet, Rohat, Erg¨un,
˙
Inan, Fatma,
Burcu, Sultan and all my friends who always cared about my work and increased
my motivation, which I have strongly needed.
I would like to thank Eliya B¨uy¨ukkaya who has always been with me with her
endless love, support and understanding.
Finally, I would like to express my deep est gratitude for the constant support,
encouragement, trust and love that I received from my family.
v
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