On projective morphisms of varieties with nef anticanonical divisor

Title from PDF of title page (University of Missouri--Columbia, viewed on July 29, 2013).The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.Dissertation advisor: Dr. Qi ZhangIncludes bibliographical references.Vita.Ph. D. University of Missouri-Columbia, 2012."July 2012."We shall study and discuss some important properties of the projective varieties with nef anticanonical bundles and nef tangent bundles. And we shall review some background and history about the subject. Then we shall use weak positivity theorem to give a new proof of a theorem of Olivier Debarre without using mod p reduction, which gives an affirmative answer to a question raised by Fujino and Gongyo.Includes bibliographical reference