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 transformation of a collection of objects is a rule that describes how to transform or move each object in the collection. For us, the objects are the points in the familiar coordinate plane and the collection is the plane itself (composed of all its points). A transformation, then, is a rule that describes how to move each of the points in the plane to new locations. Every point has to go somewhere -- even if it is just to where it was in the first place. No two different points can go to the same place.