Don't know the meaning of this symbol in equation for LGD.?

I'm attempting to implement a program to plot a TCIF spectrogram, a sort of 3-D Fourier spectrogram, and the paper specifying the technique details two distinct approaches. I've successfully implemented the algorithm using Finite Difference approximations, and would like to implement the Auger-Flandrin method. The problem is, there are two symbols which I am not familiar with, which I suppose amount to
fancy 'R'
and
fancy 'J'
I don't rightly know what the correct term for letter written in this type of font are. Sort of a calligraphy appearance. Fancy seems appropriate enough, but doesn't help me research the meaning of it.
These symbols are not explained in the paper, nor used in any other context.

http://s319.photobucket.com/albums/mm470/femtorgon/?action=view¤t=augerflandrin.jpg

If anyone can at least point me in the right direction, or give me some search term that I might be able to start research with, that would be immensely helpful.

Anonymous2009-03-24T15:52:17Z

Favorite Answer

I think it means the real and imaginary parts of the complex expression inside the { ... }.

It's an I, not a J. That font is part of the AMS (American Math Society) style sheets for the LaTeX typesetting system, it's called "math calligraphic".

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