Difference between revisions of "Modified Bessel I"
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=Properties= | =Properties= | ||
− | + | [[Relationship between Bessel I sub -1/2 and cosh]]<br /> | |
− | + | [[Relationship between Bessel I sub 1/2 and sinh]]<br /> | |
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<strong>Proposition:</strong> The following formula holds: | <strong>Proposition:</strong> The following formula holds: |
Revision as of 08:04, 5 June 2016
The modified Bessel function of the first kind is defined by $$I_{\nu}(z)=i^{-\nu}J_{\nu}(iz),$$ where $J_{\nu}$ is the Bessel function of the first kind.
Domain coloring of analytic continuation of $I_1(z)$.
Properties
Relationship between Bessel I sub -1/2 and cosh
Relationship between Bessel I sub 1/2 and sinh
Proposition: The following formula holds: $$I_{\nu}(z)=\displaystyle\sum_{k=0}^{\infty} J_{\nu+k}(z) \dfrac{z^k}{k!},$$ where $J_{\nu}$ denotes the Bessel function of the first kind.
Proof: █
Theorem
The following formula holds: $$\mathrm{Bi}(z)=\sqrt{\dfrac{z}{3}} \left( I_{\frac{1}{3}}\left(\frac{2}{3}x^{\frac{3}{2}} \right) + I_{-\frac{1}{3}} \left( \frac{2}{3} x^{\frac{3}{2}} \right) \right),$$ where $\mathrm{Bi}$ denotes the Airy Bi function and $I_{\nu}$ denotes the modified Bessel $I$.
Proof
References
Bessel $I_{\nu}$