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The riddle of the Indeterminate Dyad has long puzzled students of Plato, starting right with Aristotle. Plato himself never used the term in his extant writings. Yet it is considered to be a key part of his esoteric teachings. Aristotle himself, however, cannot seem to make sense of it. So the riddle dates back to the very beginning. It is solved in this study. This book begins with a new interpretation of the notorious geometry lesson of Theodorus (‘Theaetetus’ 147c-148b). Unlike previous attempts at a solution, it is rooted in the fine detail of Plato’s Greek prose, and relies solely on Pythagorean techniques known to be contemporary to the protagonists.