# What is the indefinite integral of Bessel function of 1 order (first k

• I
• AhmedHesham
In summary, the indefinite integral of the Bessel function of first order is given by ∫J₁(x)dx = xJ₀(x) + C, where J₀(x) is the Bessel function of zeroth order and C is the constant of integration. This integral is used to calculate the area under the curve of the Bessel function, and can also be used in solving differential equations involving Bessel functions. It is an essential tool in the study of special functions and has many applications in physics, engineering, and other fields.
AhmedHesham
Hi
When we find integrals of Bessel function we use recurrence relations.
But this requires that we have the variable X raised to some power and multiplied with the function .
But how about when we have Bessel function of first order and without multiplication?
How should we integrate it ?

It is easier if you write out explicitly in correct notation what you are asking about. It seems to me you are asking about what the primitive function of ##J_n(x)## is. In the general case, like with many other functions, there is no closed form solution to this.

Orodruin said:
It is easier if you write out explicitly in correct notation what you are asking about. It seems to me you are asking about what the primitive function of ##J_n(x)## is. In the general case, like with many other functions, there is no closed form solution to this.
The recurrence relations help writing the integrals of Bessel functions in terms of other Bessel functions of other orders.

AhmedHesham said:
The recurrence relations help writing the integrals of Bessel functions in terms of other Bessel functions of other orders.
Again, these are special cases.

AhmedHesham said:
But how about when we have Bessel function of first order and without multiplication?
How should we integrate it ?
Are you asking for ##\int J_1(x) \, dx##? If so, then it has a particularly simple answer. Do you know a function ##y## such that ##dy/dx = J_1(x)## ? Hint: ##y## is a Bessel function.

Anyway, in general for complicated integrals with special function the first place I look is
https://dlmf.nist.gov/
the section on Bessel function includes a fair number of integrals.
Jason

AhmedHesham
jasonRF said:
Anyway, in general for complicated integrals with special function the first place I look is
https://dlmf.nist.gov/
the section on Bessel function includes a fair number of integrals.
Jason
Ok
Thanks
This really helps

## What is the indefinite integral of Bessel function of 1 order (first k)?

The indefinite integral of Bessel function of 1 order (first k) is a mathematical function that represents the area under the curve of the Bessel function. It is represented by the symbol ∫ J1(x) dx, where J1(x) is the Bessel function of 1 order.

## How is the indefinite integral of Bessel function of 1 order (first k) calculated?

The indefinite integral of Bessel function of 1 order (first k) is calculated using integration techniques such as substitution, integration by parts, or partial fractions. It can also be calculated using tables of integrals or computer software.

## What is the significance of the indefinite integral of Bessel function of 1 order (first k)?

The indefinite integral of Bessel function of 1 order (first k) has many applications in physics and engineering, particularly in the fields of signal processing, heat transfer, and quantum mechanics. It is also used in the solution of differential equations involving Bessel functions.

## Is there a closed-form solution for the indefinite integral of Bessel function of 1 order (first k)?

Yes, there is a closed-form solution for the indefinite integral of Bessel function of 1 order (first k). It is given by ∫ J1(x) dx = xJ0(x) + C, where J0(x) is the Bessel function of 0 order and C is the constant of integration.

## Can the indefinite integral of Bessel function of 1 order (first k) be expressed in terms of other mathematical functions?

Yes, the indefinite integral of Bessel function of 1 order (first k) can be expressed in terms of other mathematical functions, such as the sine and cosine functions. It can also be expressed in terms of the exponential integral function or the hypergeometric function.

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