Translations:Documentation/Calc Functions/BESSELJ/17/en
The following figure shows a plot of the Bessel functions of the first kind for orders 0, 1, 2, and 3.
Bessel functions of the first kind are finite at the origin, x = 0. They exhibit odd or even parity depending on the order of the function, so that Jn(-x) = Jn(x) for even orders and Jn(-x) = -Jn(x) for odd orders.