What physical and breathing practices would help during painful days of cluster headache? 1. Spot jogging (20 - 40) with awareness of the feet and toes while counting the steps and suggesting that you are pushing the prana down to the feet.
Usually sets of geometric transformations are considered such that each finite sequence of transformations in the set can be replaced by one transformation of the set, and a transformation inverse to any of those considered also belongs to the given set.
A reflection is called a rigid transformation or isometry because the image is the same size and shape as the pre-image. The reflection line, m, is the perpendicular bisector o f the segments joining each point to its image. Notice that these segments are parallel, since they are perpendicular to the same line.