modified Bessel equation

modified Bessel equation

[¦mōd·ə‚fīd ′bes·əl i‚kwā·zhən]
(mathematics)
The differential equasion z 2ƒ″(z) + z ƒ′(z) - (z 2+ n 2)ƒ(z) = 0, where z is a variable that can have real or complex values and n is a real or complex number.
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