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Some have interpreted the expression "τὰ μετὰ τὰ φυσικά" to imply that the subject of the work goes "beyond" that of Aristotle's Physics or that it is metatheoretical in relation to the Physics.But others believe that "τὰ μετὰ τὰ φυσικά" referred simply to the work's place in the canonical arrangement of Aristotle's writings, which is at least as old as Andronicus of Rhodes or even Hermippus of Smyrna.This, then, disrupts the correspondence of letters to numbers, as book 2 is little alpha, book 3 is beta, and so on.
He believed that in every change there is something which persists through the change (for example, Socrates), and something else which did not exist before, but comes into existence as a result of the change (musical Socrates).
How can things continue to exist, and yet undergo the change we see about us in the natural world? By the time Aristotle was writing, the tradition of Greek philosophy was only two hundred years old.