This thesis summarizes a wonderful period I spent in Tel Aviv University. First and foremost, I had the pleasure of being supervised by Isaac Meilijson and Eytan Ruppin, whose brilliance can only be compared with their good-heartedness. My greatest debt is to Eytan for taking me under his wing, teaching me what science and research are all about and making me believe in myself. I can only hope that I have paid a percent of this debt in the years we have been working together, and make my best to pay some of the rest when we meet further down the road. My main debt to Isaco is for taking the time and effort to discuss with me each and every statistical or mathematical issue that has arisen. Several such long discussions have lead the way to about half of the advancements presented in this thesis. During my Ph.D. period, I had the pleasure of collaborating with several gifted people. Ben Sandbank has been my partner both to two papers and to numerous stimulating discussions just about everything, the outcome of most of which is still in the drawer. To Zohar Ganon, Alon Kaufman and Keren Saggi
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