An '''n'''-dimensional '''Euclidean space''' (usually denoted by '''R'''<sup>''n''</sup>) is the [[cartesian product]] of '''n''' copies of the [[real line]]. | An '''n'''-dimensional '''Euclidean space''' (usually denoted by '''R'''<sup>''n''</sup>) is the [[cartesian product]] of '''n''' copies of the [[real line]]. |