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    I want to thank those who have helped me write this book. I am extremely grateful to God for guiding me. I also want to thank my uncle, José Celso Barbosa Muñiz, who spent some time reading this text and giving me advice. Despite our philosophical and political differences, his advice has been invaluable. I also thank my friend and former thesis director Guillermo E. Rosado Haddock for his valuable advice. I also wish to thank him and Claire Ortiz Hill for their invaluable work on Edmund Husserl, their exposition of his philosophy of mathematics, and his platonist proposal. I want to thank my very dear friends Margot Acevedo and Fiera Monica Tenkiller, who proof-read my book. Any mistakes in this book are not theirs, they are entirely my own. I thank Carlos Rubén Tirado who has been one of my guides in philosophy, his advice has inspired many of the arguments I present here.

    I thank Jerrold J. Katz, whose books The Metaphysics of Meaning and Realistic Rationalism contributed much to strengthen my platonist philosophical convictions.

    For this third edition, I'm grateful to Saroya Poirier for her help.

    Finally, I wish to thank philosophers of mathematics, philosophers of science, and epistemologists in general, because, regardless of their philosophical positions, their texts have always served as never-ending stimuli for philosophical reflection. Most of all, from all of these I am indebted to Aristotle, Edmund Husserl, and Karl Popper, three of the greatest philosophers in history, who have led us to today's epistemological discussions, and worked intensely in the relation between science (in the original sense of the word Wissenschaft in German), mathematics, and logic.