In mathematics, a measure-preserving dynamical system is an object of study in the abstract formulation of dynamical systems, and ergodic theory in particular. In mathematics, a measure-preserving dynamical system is an object of study in the abstract formulation of dynamical systems, and ergodic theory in particular. A measure-preserving dynamical system is defined as a probability space and a measure-preserving transformation on it. In more detail, it is a system