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In this dissertation separation and selection theorems are presented. It begins by presenting a detailed proof of the Inductive Definability Theorem of D. Cenzer and R.D. Mauldin, including their boundedness principle for monotone coanalytic operators.

This paper investigates the compact-open topology on the set of C_k(X) of continuous real-valued functions defined on a Tychonoff space X. More precisely, we study the following problem: If P is a topological property, does there exist a topological property Q so that C_k(X) has P if and only if X has Q? Characterizations of many properties are obtained throughout the thesis, sometimes modulo some “mild” restrictions on the space X. The main properties involved are summarized in a diagram in the introduction. / Ph. D.

Let X be a Polish space and Q a measurable partition of X into Gδ equivalence classes. In 1978, S. M. Srivastava proved the existence of a Borel cross section for Q. He asked whether more can be concluded in case each equivalence class is uncountable. This question is answered here in the affirmative. The main result of the author is a proof that shows the existence of a Castaing Representation for Q.

Spectral theory, mathematical system theory, evolution equations, differential and difference equations [electronic resource] : 21st International Workshop on Operator Theory and Applications, Berlin, July 2010.It is known that lattice homomorphisms and G-solvable positive operators on Banach lattices have cyclic peripheral spectrum (See [17]). In my thesis I prove that positive contractions whose spectral radius is 1 on Banach lattices with increasing norm have cyclic peripheral point spectrum. I also prove that if the Banach lattice is a K B space satisfying the growth conditon and º is an eigenvalue of a positive contraction T such that [º] = 1, then 1 is also an eigenvalue of T as well as an eigenvalue of T¨, the dual of T. I also investigate the conditions on contraction operators on Hilbert lattices and AL-spaces which guanantee that 1 is an eigenvalue. As we know from [17], if T : E-E is a positive ideal irreducible operator on E such the r (T) = 1 is a pole of the resolvent R(º, T), then r (T) is simple pole with dimN (T -r(T)I) and ºper(T) is cyclic. Also all points of ºper(T) are simple poles of the resolvent R(º,T). SInce band irreducibility and º-order continuity do not imply ideal irreducibility [2], we prove the analogous results for band irreducible, º-order continuous operators. / by Cheban P. Acharya. / Thesis (Ph.D.)--Florida Atlantic University, 2012. / Includes bibliography. / Mode of access: World Wide Web. / System requirements: Adobe Reader.

Thesis (Ph. D.)--Carleton University, 2002. / Includes bibliographical references (p. 95-98). Also available in electronic format on the Internet.

Thesis (doctoral)--Technische Hogeschool Eindhoven, 1983. / Text in English ; summary and vita in Dutch. Includes indexes. Vita. Includes bibliographical references (p. 190-193).

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Made available in DSpace on 2014-06-11T19:27:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-06-17Bitstream added on 2014-06-13T20:47:44Z : No. of bitstreams: 1 araujo_jp_me_rcla.pdf: 571397 bytes, checksum: aa8e71371a3c485d93ebe5d75dc6a465 (MD5) / O principal objetivo deste trabalho é demonstrar teoremas relevantes como o Teorema Fundamental da Álgebra e o Teorema do Ponto Fixo de Brouwer no plano, além dos problemas de extensão e levantamento e o Teorema de Mayer-Vietoris. Para isto, primeiramente associamos a cada espaço topológico X uma estrutura de grupo ou de conjunto G(X), e a cada função contínua f : X → Y um homomor smo de estruturas f∗ : G(X) → G(Y ) ou f∗ : G(Y ) → G(X) satisfazendo determinadas propriedades / The main objective is to prove relevant theorems as the Fundamental Theorem of Algebra and Brouwer's Fixed Point Theorem in the plane, besides the problems of extension and lifting theorem and the Mayer-Vietoris Theorem. For this, rst we associate to each topological space X a group structure or set G(X), and every continuous function f : X → Y a homomorphism f∗ : G(X) → G(Y ) or f∗ : G(Y ) → G(X) satisfying certain properties

In this note, we present some of the basic properties of the classes of functions called strongly preclosed closed and pre-irresolute functions in topological spaces.