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Any proposition concerning the [fundamental] nature of reality, existence, and being that lies beyond or underlies the physical world accessible to science. It deals with questions of what is ultimately real: Is consciousness a product of the brain or a [fundamental] property of the universe? Do abstract concepts like numbers or justice have a real existence? Metaphysical hypotheses provide the foundational [assumptions] upon which other systems (science, religion) are built, but are themselves notoriously difficult to test empirically.
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