Assertion: isometry's point | /r/HasProperty | line
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text: More narrowly, a reflection refers to a reflection in a hyperplane ( n − 1 {\displaystyle n-1} dimensional affine subspace – a point on the line, a line in the plane, a plane in 3-space), with the hyperplane being fixed, but more broadly reflection is applied to any involution of Euclidean space, and the fixed set (an affine space of dimension k, where 1 ≤ k ≤ n − 1 {\displaystyle 1\leq k\leq n-1} ) is called the mirror.