However , a glide plane operation with a nonzero translation vector in the plane can not be reduced like that .
The combination of a reflection in a plane and a translation in a perpendicular direction is a reflection in a parallel plane .
A glide plane operation with a nonzero translation vector in the plane can not be reduced like that .
The combination of a reflection in a plane and a translation in a perpendicular direction is a reflection in a parallel plane .