1. The problem statement, all variables and given/known data In the 4-D Minkowski vector space [you can think of this as the locations of events in space-time given by (t, x, y, z)] consider the vectors pointing to the following events: (4ns, -1m, 2, 7) and (2ns, 3m, 1m, 9m) (a) Find the distance between the events. (b) Find the innerproduct between the two events. 2. Relevant equations Distance Formula 3. The attempt at a solution My initial thoughts are to "subtract" one point from another to get a vector from the first point to the second. Then take the square root of the sum of each component squared. The only thing that bothers me is the different units (ns and m). For part (b), the inner product is just a dot product of the two original vectors. Is that a correct assumption? (I've never studied anything like this before, and it seems important.) Thanks in advance for any advice!