Talk:Fourier transform

Tried to add some precision to the article, still needs a lot of work to get it in shape. For example, it doesn't really make sense to talk about orthogonality of a family of sine and cosine functions ranging over a continuum of frequencies from $\scriptstyle -\infty$ to $\scriptstyle \infty$, in what sense are they orthogonal? This is different from the case of a Fourier series in which you have a family sine and cosine functions whose frequencies are integral multiples of some fundamental frequency. Hendra I. Nurdin 21:50, 12 April 2008 (CDT)