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So I am supposed to draw and find the displacement vector between to points in spacetime, coordinates being (3,2,0,0) and (-2,1,0,0). I somehow feel slightly stupid for asking this, but I was reading the textbook and looking through my lecture notes. What I basically did that draw a standard 2D coordinate system wit ct and x as axis, add the two points draw the vector from the (-2,1,0,0) to (3,2,0,0) and find the distance using the line element formula in Minikowiski space:

[tex] \Delta S^2 = -(\Delta ct)^2 + \Delta x^2 + \Delta y^2 + \Delta z^2 [/tex]

Does that sound about right? I might be reading too much into this as the -2 for the ct component is throwing me off.

Cheers,

Biest

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# Homework Help: Slightly confused with Spacetime Diagrams

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