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Parmenides was a Greek philosopher who founded Eleaticism, a pre-Socratic school of thought. He proposed that reality is a single, eternal, and unchanging entity he called "Being," and that the perceived multiplicity and motion of the world are mere illusions. This concept, that "all is one," is a cornerstone of his philosophy and led him to argue that change and non-Being are illogical. Parmenides is considered a founder of metaphysics for his method of basing claims on a logical concept of Being.1

Plato's dialogue, the Parmenides, engages with Parmenides' ideas. In this work, Plato explores his own theory of forms, which posits perfect, unchanging exemplars of concepts. The dialogue critiques the notion that sensible things merely imitate these forms and delves into complex logical exercises to refine the understanding of forms and their relationship to reality. The Parmenides is a key text for understanding Plato's philosophical development, particularly his engagement with Parmenides' concept of the One.234

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