Digital Library of Mathematical Functions
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NIST
10 Bessel FunctionsModified Bessel Functions

§10.28 Wronskians and Cross-Products

10.28.1 𝒲{Iν(z),I-ν(z)}=Iν(z)I-ν-1(z)-Iν+1(z)I-ν(z)=-2sin(νπ)/(πz),
10.28.2 𝒲{Kν(z),Iν(z)}=Iν(z)Kν+1(z)+Iν+1(z)Kν(z)=1/z.