In mathematics, an exponential sum may be a finite Fourier series (i.e. a trigonometric polynomial), or other finite sum formed using the exponential function, usually expressed by means of the function
Therefore a typical exponential sum may take the form
summed over a finite sequence of real numbers xn.
Read more about Exponential Sum: Formulation, Estimates, History, Types of Exponential Sum, Example: The Quadratic Gauss Sum
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“If the twentieth century is to be better than the nineteenth, it will be because there are among us men who walk in Priestley’s footsteps....To all eternity, the sum of truth and right will have been increased by their means; to all eternity, falsehoods and injustice will be the weaker because they have lived.”
—Thomas Henry Huxley (1825–95)