 Aristotle sometimes recognizes infinite divisibility—the property of being divisible into parts which can themselves be further divided, the process never terminating in an indivisible—as a consequence of continuity as he characterizes the notion. But on occasion he takes the property of infinite divisibility as defining continuity. It is this definition of continuity that figures in Aristotle’s demonstration of what has come to be known as the isomorphism thesis, which asserts that either magnitude, time and motion are all continuous, or they are all discrete.