Issue I420 [libraries,enhancement,resolved] New Bessel functions in SIMION Lua libraries. As of 8.0.4-TEST6, New Bessel special functions have been added to the simionx.SpecialFunctions library. These are useful for expressing analytic solutions to the Laplace equation under cylindrical symmetry. bessel_i0(x) - first kind, order 0 bessel_i1(x) - first kind, order 1 bessel_in(n, x) - first kind, order n (non-negative integer) bessel_i0_zero(k) - k-th zero of first kind, order 0 bessel_y0(x) - second kind, order 0 bessel_y1(x) - second kind, order 1 bessel_yn(n, x) - second kind, order n (non-negative integer) bessel_i0(x) - modified first kind, order 0 bessel_i1(x) - modified first kind, order 1 bessel_k0(x) - modified second kind, order 0 bessel_k1(x) - modified second kind, order 1 See "Libraries API Reference" in "Help|Browse Documentation" for details. Implemented in 8.0.4-TEST6.