finite trigonometric sum
An expression of the form
with real coefficients , ; the number is called the order of the trigonometric polynomial (provided ). A trigonometric polynomial can be written in complex form:
Trigonometric polynomials are an important tool in the approximation of functions.
Cf. also Trigonometric series.
Trigonometric polynomial. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Trigonometric_polynomial&oldid=11930