What does exact mean your expression 'double Fourier series?...
a) a Fourier series in two dimesions
b) a Fourier series in the complex domain
c) something else
Please help me : In calculus ,I only know Fourier Series,But in Real world,I need to know Double Fourier Series,and i don't know where to find the theory of double fourier series ,i use google,but don't find.
so i want to know where can find this theory(basic),and which book discuss this good. can Someone would teach me this theory ?
Thanks very much.....