This chapter discusses how four-dimensional geometry was used to solve a problem in physics, namely the problem regarding the ether (the all-pervasive medium that transmitted waves of light). It introduces the four-dimensional invariant spacetime object, which Henri Poincaré invented in an effort to explain the absence of the ether. This, along with Albert Einstein's ideas on changing clocks, led to the creation of a geometric vision of relativity. In addition, this chapter considers the rigid slicing model of four-dimensional geometry and Hermann Minkowski's four-dimensional matrix of time and space.
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