(First: to the moderator: I am not sure if this should go here or in general relativity, because it spans both topics.)(adsbygoogle = window.adsbygoogle || []).push({});

Google "non-differentiable space-time" and one gets lots of interesting papers. But I am missing one essential idea that I am sure should be obvious: these papers continue to use equations and formulas which are, or are based on, differential equations. If one is investigating a non-differentiable space, how can you apply formulas that require that your space be differentiable?

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# Non-differentiable space-time

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