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Allan,
On Mon, 25 Feb 2002 12:29:19 -0800 (PST), you wrote:
>with the risk of sounding like a teacher, I dont believe you have your
>facts straight. The most general version of Fourier (incl sampling
>theorem) that I'm aware of requires the underlying function to be L2.
>All the data I've seen on stock prices certainly doesn't indicate that
>they are L2. I don't remember where I saw it, but I believe that there
>is even research indicating that the variance is ever increasing, hence
>no chance of every being L2.
L2 may be a precondition for Fourier _analysis_ (even if not at all
relevant there in most practical cases), but not for applying
Fourier's sampling theorem.
mfg rudolf stricker
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