Speaking of math software, can anyone tell me if there exists analytic continuation software? In particular, given a subroutine f_0 to evaluate an analytic function f on a disk D_0 in C centered at z_0 and of radius R_0, and a curve a: [0,L] -> C with a(0) = z_0 . . . . . . then -- the software would output a set of curve parameters 0 = t_0 < t_1 < t_2 < . . . < t_n = L and radii R_k, 1 <= k <= n such that the original function f_0 element can be successively continued along curve a(t) to the function elements f_k, via the disks D_k of radius R_k about z_k = a(t_k), for 1 <= k <= n (where of course f_(k-1) must agree with f_k on the overlap of D_(k-1) and D_k). The software would also output a routine that will evaluate the function f_k inside the disk D_k. (Or a statement that the function cannot be continued along a(t), 0 <= t <= L.) . . . . . . and all this to a pre-specified level of numerical accuracy. NOTE: The hardest part here is probably ensuring the numerical accuracy of the f_k's. --Dan _____________________________________________________________________ "It don't mean a thing if it ain't got that certain je ne sais quoi." --Peter Schickele