A group homomorphism between dimension group is said to be contractive if it is scale-preserving. Action potentials are considerably different between conductive and contractive cardiomyocytes. An operator satisfying formula 125 is called contractive. When their activity is waning (slow or contractive), that is the "yin" energy mode. A circular arrangement has rings of contractive fibers around the long axis. Contractive maps are sometimes called Lipschitzian maps. IFS only require that the whole system be contractive on average.