# A question about Bessel function

by zetafunction
Tags: bessel, function
 P: 399 if $$J_{u}(x)$$ is a Bessel function.. do the following functions has special names ? a) $$J_{ia}(ib)$$ here 'a' and 'b' are real numbers b) $$J_{ia}(x)$$ the index is complex but 'x' is real c) $$J_{a}(ix)$$ here 'x' is a real number but the argument of the Bessel function is complex.