function series
series in which the summands are not just real or complex numbers but functions
power series
infinite sum of monomials
Fourier series
decomposition of periodic functions into sums of simpler sinusoidal forms
Dipole model of the Earth's magnetic field
simple approximation of Earth's magnetic field
trigonometric series
sum of sines and cosines with corational frequencies
Puiseux series
power series with rational exponents
Laurent series
power series generalized to allow negative powers