Four-Vector

A four-vector is a mathematical object used in physics, particularly in the theory of relativity. It combines space and time into a single framework. Instead of treating position as separate from time, a four-vector allows us to represent an event in a four-dimensional space, with three dimensions for space (x, y, z) and one for time (ct, where c is the speed of light). This concept helps describe how objects move and interact at high speeds, providing a more complete understanding of motion and the effects of gravity in the universe.