BesselI

Notations

Traditional name

Traditional notation

Mathematica StandardForm notation

Primary definition

Specific values

Specialized values

For fixed ν

For fixed z

Values at fixed points

Values at infinities

General characteristics

Domain and analyticity

(Subscript[I, ν])(z) is an analytical function of ν and z, which is defined in (ℂ^2).

Symmetries and periodicities

Parity

Mirror symmetry

Periodicity

No periodicity

Poles and essential singularities

With respect to z

For fixed ν, the function (Subscript[I, ν])(z) has an essential singularity at z==(OverTilde[∞]). At the same time, the point z==(OverTilde[∞]) is a branch point for generic ν.

With respect to ν

For fixed z, the function (Subscript[I, ν])(z) has only one singular point at ν =(OverTilde[∞]).  It is an essential singular point.

Branch points

With respect to z

With respect to ν

For fixed z, the function (Subscript[I, ν])(z) does not have branch points.

Branch cuts

With respect to z

With respect to ν

For fixed z, the function (Subscript[I, ν])(z) is an entire function of ν and does not have branch cuts.

Series representations

Generalized power series

Expansions at ν==±n

Expansions at generic point z==(Subscript[z, 0])

Expansions on branch cuts

Expansions at z==0

Asymptotic series expansions

Expansions inside Stokes sectors

Expansions for any z  in exponential form

Pavlyk 0. (2006)

Expansions for any z  in trigonometric form

Residue representations

Integral representations

On the real axis

Of the direct function

Contour integral representations

Limit representations

Generating functions

P. Abbott

Differential equations

Ordinary linear differential equations and wronskians

For the direct function itself

Involving related functions

Transformations

Transformations and argument simplifications

Argument involving basic arithmetic operations

Addition formulas

Multiple arguments

Identities

Recurrence identities

Consecutive neighbors

Distant neighbors

Functional identities

Relations between contiguous functions

Relations of special kind

Differentiation

Low-order differentiation

With respect to ν

Brychkov Yu.A. (2005)

Brychkov Yu.A. (2005)

With respect to z

Symbolic differentiation

With respect to ν

With respect to z

Fractional integro-differentiation

With respect to z

Integration

Indefinite integration

Involving only one direct function

Involving one direct function and elementary functions

Involving functions of the direct function

Involving functions of the direct function and elementary functions

Involving direct function and Bessel-type functions

Definite integration

For the direct function itself

Integral transforms

Laplace transforms

Summation

Infinite summation

Representations through more general functions

Through hypergeometric functions

Involving Hypergeometric0F1Regularized

Involving Hypergeometric0F1

Involving Hypergeometric1F1

Through Meijer G

Classical cases for the direct function itself

Classical cases involving Exp

Classical cases involving Cosh

Classical cases involving Sinh

Classical cases involving Cosh, Sinh

Classical cases for powers of Bessel BesselI

Classical cases for products of Bessel BesselI

Classical cases involving Bessel BesselJ

Classical cases involving Bessel BesselK

Classical cases involving Bessel BesselY

Classical cases involving Struve StruveL

Classical cases involving Hypergeometric0F1

Classical cases involving Hypergeometric0F1Regularized

Generalized cases for the direct function itself

Generalized cases involving Cosh

Generalized cases involving Sinh

Generalized cases involving Cosh, Sinh

Generalized cases involving AiryAi

Generalized cases involving AiryAiPrime

Generalized cases involving AiryBi

Generalized cases involving AiryBiPrime

Generalized cases for powers of Bessel BesselI

Generalized cases for products of Bessel BesselI

Generalized cases involving Bessel BesselJ

Generalized cases involving Bessel BesselK

Generalized cases involving Bessel BesselY

Generalized cases involving Struve StruveL

Generalized cases involving Hypergeometric0F1

Generalized cases involving Hypergeometric0F1Regularized

Through other functions

Representations through equivalent functions

With related functions

Theorems

I-transformation

(Subscript[(OverHat[f]),  ν])(y)==(∫_0^∞)f(x)(Sqrt[x y])(Subscript[I,  ν])(x y)dx ⇔ f(x)==(1/(π i ))(∫_(γ-i ∞)^(γ+i ∞))(Subscript[(OverHat[f]),  ν])(y)(Sqrt[x y])(Subscript[K,  ν])(x y)dy/;ν≥-(1/(2 ))

Unitary representations of the real Euclidean group

Bessel functions of integer order appear as the matrix elements of the unitary representations of the real Euclidean group (Subscript[E, 3]) in the (e^(i n ϕ)) basis.

The radial current density

The radial current density of a high frequency current with time dependence i=(Subscript[i, 0])cos(ω t) flowing through a straight circular conductor of radius R is given by i(r)∝(Subscript[i, 0])Re((Subscript[I, 0])((Sqrt[i])(r/ξ))/(Subscript[I, 0])((Sqrt[i])(R/ξ))), where ξ is a function of the conductivity and the frequency ω.

A simple continued fraction

The simple continued fraction with arithmetic progression

a+(1/(a+d+(1/(a+2 d+(1/(a+3 d+(1/⋱)))))))

has the closed form (Subscript[I, (a/d)-1])((2/d))/(Subscript[I, (a/d)])((2/d)).

Random walks

The probability (Subscript[w, t]) for a random walker who starts at t=0 at the origin of a d dimensional cubic lattice to be at the point {(Subscript[n, 1]),(Subscript[n, 2]),…,(Subscript[n, d])} at time t (t∈ ℕ) is:

(Subscript[w, t])==((∂^t)/(∂(ξ^t)))(∏_(k=1)^d)(Subscript[I, n])((ξ/d))(Subscript[|, ξ=0])

History

– A. B. Basset (1888)

Applications of (Subscript[I, ν])(z) include electrodynamics, solid state physics, celestial mechanics, quantum chromodynamics, radiation theory, and the Aharonov–Bohm effect.

Copyright