Volume-Preserving Transformations of Solid of Revolution
Suppose a function is defined for , and let a transformation be defined by . We have . This means that the volume of the solid enclosed by the surface of revolution of around the axis remains unchanged.[more]
Supposing that the volume of a muscle remains unchanged by its contraction, this transformation presents a simple model of muscle contraction. We use the function .[less]
 G. A. Tsianos and G. E. Loeb. "Muscle Physiology and Modeling." Scholarpedia. (Jan 20, 2016). doi:10.4249/scholarpedia.12388.