A form that is genuinely 'one over many' participates in its own nature only if self-predication holds, but self-predication leads to the Third Man regress, undermining the claim that any such form is coherently one.

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One over many(as used in metaphysics): A philosophical phrase meaning a single universal idea or pattern that many individual things share—for example, the single concept of 'chair' that applies to many different chairs.
Participates(as used in metaphysics): In Plato's theory, when a physical object 'participates' in a Form, it means that object imperfectly copies or resembles that perfect, universal idea.
Regress(as used in epistemology and logic): An infinite chain of reasoning where each explanation requires another explanation, like asking 'why?' infinitely and never reaching a final answer.
Self-Predication(Third Man argument): A principle relied upon in the Third Man argument stating that a Form itself instantiates the predicate it corresponds to (e.g., the Form of Largeness is itself large).

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