"In classical Newtonian physics there was a clear understanding of 'what reality is'. Indeed in this classical view, reality at a certain time is the collection of all what is actual at this time, and this is contained in 'the present'. Often it is stated that three dimensional space and one dimensional time have been substituted by four dimensional space-time in relativity theory, and as a consequence the classical concept of reality, as that what is 'present', cannot be retained. Is reality then the four dimensional manifold of relativity theory? And if so, what is then the meaning of 'change in time'?"
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Aerts, D. (1996). "Relativity theory: what is reality?". Foundations of Physics, 26, pp. 1627-1644
https://en.wikiquote.org/wiki/Diederik_Aerts
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Diederik Aerts
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