Euclidean space is the fundamental space of classical

*geometry*. Originally it was the*three*-*dimensional**space*of Euclidean*geometry*, but in modern*mathematics*there are Euclidean spaces of any nonnegative integer dimension, including the*three*-*dimensional**space*and the Euclidean*plane*(dimension two). It was introduced by the Ancient Greek mathematician Euclid of Alexandria, and the qualifier Euclidean is used to distinguish it from other spaces that were later discovered in physics and modern*mathematics*. Ancient Greek geometers introduced Euclidean space for modeling the physical universe.