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    This thesis explores methodological approaches to studying substantivalism in metaphysics and the philosophy of science. My primary aim is to show that it is only when these two disciplines come together, that we can hope to make progress with respect to discovering the true nature of the structure of space-time. I begin by looking at Leibniz’s argument that substantivalism entails the possibility of qualitatively indiscernible worlds, which differ only with respect to how the material world is …Read more