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A real function (that is, a function from real numbers to real numbers) can be represented by a graph in the Cartesian plane; such a function is continuous if, roughly speaking, the graph is a single unbroken curve whose domain is the entire real line. Cauchy defined infinitely small quantities in terms of variable quantities, and his definition of continuity closely parallels the infinitesimal definition used today (see microcontinuity). A form of the epsilon\u2013delta definition of continuity was first given by Bernard Bolzano in 1817. In contrast, the function M(t) denoting the amount of money in a bank account at time t would be considered discontinuous since it “jumps” at each point in time when money is deposited or withdrawn. As a practical example, the function H(t) denoting the height of a growing flower at time t would be considered continuous.<\/p>\n<\/p>\n