The Evolution of Expander Graphs

Acknowledgements First and foremost I'd like to thank my advisor Prof. Salil Vadhan for many fruitful discussions and for his support and guidance. Many thanks to Prof. Michael Rabin and Minh-Huyen Nguyen for their encouragement and help in the editing process. And my deepest gratitude to my parents for giving me the opportunity to reach this point. All that I've accomplished is because of you.

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