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BesselK
 BesselK[n, z] gives the modified Bessel function of the second kind  .
Mathematical function (see Section A.3.10).
 satisfies the differential equation  .
BesselK[n, z] has a branch cut discontinuity in the complex z plane running from  to  .
FullSimplify and FunctionExpand include transformation rules for BesselK.
See The Mathematica Book: Section 3.2.10.
See also: BesselI, AiryAi, BesselJ.
Further Examples
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