A question about Bessel function

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SUMMARY

The discussion focuses on the properties of Bessel functions, specifically the functions J_{ia}(ib), J_{ia}(x), and J_{a}(ix), where 'a' and 'b' are real numbers and 'x' is a real number. It establishes that Bessel functions of real order and imaginary argument are related to modified Bessel functions I_{ν}(z) and K_{ν}(z), analogous to the relationship between sine/cosine and sinh/cosh. For further exploration, references to the Digital Library of Mathematical Functions are provided for deeper insights into Bessel functions with imaginary orders and arguments.

PREREQUISITES
  • Understanding of Bessel functions, specifically J_{ν}(z) and Y_{ν}(z)
  • Familiarity with modified Bessel functions I_{ν}(z) and K_{ν}(z)
  • Knowledge of complex numbers and their applications in mathematical functions
  • Basic understanding of mathematical relationships between trigonometric and hyperbolic functions
NEXT STEPS
  • Research the properties of modified Bessel functions I_{ν}(z) and K_{ν}(z)
  • Explore the Digital Library of Mathematical Functions for Bessel functions of imaginary order
  • Study the relationship between trigonometric functions and hyperbolic functions in depth
  • Investigate applications of Bessel functions in engineering and physics
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Mathematicians, physicists, and engineers interested in advanced mathematical functions, particularly those working with Bessel functions and their applications in various fields.

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if J_{u}(x) is a Bessel function..

do the following functions has special names ?

a) J_{ia}(ib) here 'a' and 'b' are real numbers

b) J_{ia}(x) the index is complex but 'x' is real

c) J_{a}(ix) here 'x' is a real number but the argument of the Bessel function is complex.
 
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Bessel functions ##J_\nu(z),~Y_\nu(z)## of real order and imaginary argument are related to the modified Bessel functions ##I_\nu(z),~K_\nu(z)## in a similar way as sine and cosine are related to sinh and cosh.

For imaginary order, see this Bessel function subpage on the Digital Library of Mathematical functions; for imaginary order and imaginary argument (i.e., the modified Bessel functions of imaginary order), see this page.
 

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