Terms for subject Mathematics containing expansion of a function

English	Russian
a Fourier series is an expansion of a function in a series of sines and cosines	ряд по синусам и косинусам
a the one-dimensional Taylor series expansion of a real function about a point	разложение в ряд
expansion of a function	развёртывание функции
expansion of a function in a series	разложение функции в ряд
the a power series expansion of a function in x	разложение в ряд по степеням