we know that the simple form of the metric in the special relativity is like this: $ds^2 = dr^2 - (cdt)^2$ that in this metric $dr^2 = dx^2 + dy^2 + dz^2 .$ I want to ask why we minus the time sentence? I know the mathematical reasons but I wanna know what happens in nature and reality by minus of the time sentence.
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