1. In order to distinguish the latter from the former, we will put an arrow on top: for instance, we already used x to denote the array (x j ) M j=1 whose elements are the points on a given grid in R. This approach becomes especially convenient when we work with functions: for example, if f (x) is a function on R, we will denote by f = f ( x) the array (f j ) M j=1 of values f j = f;the practical applications of the numerical methods we discussed, we work with two types of objects: variables (with values in C), and arrays of complex numbers
2. The fractional Fourier transform and applications;D H Bailey;SIAM Rev,1991
3. Processes of normal inverse Gaussian type