<t>Does anyone have a copy of the paper "Efficient Calibration of Time-Changed Levy Models to Forward Implied Volatility Surfaces" by Stefan Kassberger & Hanno Schmidt, that has been mentioned in this thread? Apparently it has been published only as Conference Proceedings, and will be very hard ...

<t>Hi bhutes, actually L^2 is not necessarily a 2-dim. space as you write. The 2 superscript denotes the norm/inner product that is to be used. E.g. L^2(R) is defined as all functions R -> R for which and the inner product is . This space L^2(R) is actually infinite-dimensional and I cannot think of...