Let's say that by positing the existence of some unobservable entities (e.g.,

Let's say that by positing the existence of some unobservable entities (e.g.,

Let's say that by positing the existence of some unobservable entities (e.g., strings), we can form theories which reliably predict observable behavior. Does the success of such theories provide evidence that the posited entities actually EXIST? Or is the significance of such entities merely heuristic?

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