e/Exponential sum

Information
has gloss	eng: 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
lexicalization	eng: exponential sum
instance of	(noun) a function in which an independent variable appears as an exponent exponential function, exponential

Meaning
Russian
lexicalization	rus: суммы Вейля