Introduction
The emergence of spacetime in quantum theories of gravity☆

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Our own essay starts from the recognition that the fundamental structures postulated and described in many quantum theories of gravity seem to be quite different from any conceptions of space or time appearing in previous theories, even including the spacetimes of general relativity. Naturally, this divergence comes in degrees, and we give the reader a sense of the spectrum; we also show that the divergence occurs along different dimensions. Our main goal is to argue that theories denying the

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☆

Work on this project has been supported in part by a Collaborative Research Fellowship by the American Council of Learned Societies, and (for N. H.) by a Professorial Fellowship at the Institute of Philosophy at the University of London.

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