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how can you imagine the geometrically meaning of the minus sign in ds^{2}=-dx_{0}^{2}+dx_{1}^{2}+dx_{2}^{2}+dx_{3}^{2}, maybe similar to ds^{2}=x_{1}^{2}+dx_{2}^{2}is the length in a triangle with the Pythagoras theorem?

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# I Line element in Minkowski space

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