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I understand that the distance between 2 points in 2 dimensions
sqrt(x^2 + y^2)
and in 3 dimensions it's
sqrt(x^2 + y^2 + z^2)
but in 4 dimensions, with the 4th being the change in time, why is it
sqrt(x^2 + y^2 + z^2 - (ct)^2) ?
Can somebody please explain?
sqrt(x^2 + y^2)
and in 3 dimensions it's
sqrt(x^2 + y^2 + z^2)
but in 4 dimensions, with the 4th being the change in time, why is it
sqrt(x^2 + y^2 + z^2 - (ct)^2) ?
Can somebody please explain?