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.
The Vocabulary of Transformation Geometry. In short, a transformation is a copy of a geometric figure, where the copy holds certain properties. Think of when you copy/paste a picture on your computer. The original figure is called the pre-image; the new (copied) picture is called the image of the transformation.