modified Bessel functions

modified Bessel functions

[′mäd·ə‚fīd ′bes·əl ‚fəŋk·shənz] (mathematics) The functions defined by Iv (x) = exp (-iv π/2) Jv (ix), where Jv is the Bessel function of order v, and x is real and positive. Also known as modified Bessel function of the first kind.