The system is then mapped back onto the original area by cutting and restacking, which we can call a ‘fold’. The inverse transformation is accomplished by stretching first in the vertical (\(p\)) dire...The system is then mapped back onto the original area by cutting and restacking, which we can call a ‘fold’. The inverse transformation is accomplished by stretching first in the vertical (\(p\)) direction and squashing in the horizontal (\(q\)) direction, followed by a slicing and restacking.
