High Quality Content by WIKIPEDIA articles! In physics and mathematics, a sequence of n numbers can also be understood as a location in n-dimensional space. When n = 8, the set of all such locations is called 8-dimensional Euclidean space. Whether or not the real universe in which we live is somehow eight-dimensional is a topic that is debated and explored in several branches of physics, including astrophysics and particle physics. For example, the biquaternion algebra, which is based on C4, a four-dimensional space over the field of complex numbers, has long been use to give substance to the theory of special relativity.