Closed form solutions to integrals of the following type?

Click For Summary

Discussion Overview

The discussion revolves around the possibility of finding closed form solutions for integrals of the type f(θ)^z, where z is a complex number and f(θ) includes functions like sin(θ), cos(θ), and tan(θ). The scope includes theoretical exploration of integral calculus and special functions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the possibility of explicitly solving for an antiderivative of integrals of the form f(θ)^z, particularly for f(θ) = sin(θ) with z as a complex constant.
  • Another participant asserts that it is not possible to find such solutions, even when z is real.
  • A different participant suggests that many of these integrals can be expressed in terms of hypergeometric functions.
  • A request is made for a demonstration of how such integrals can be expressed via hypergeometric functions.
  • Links to specific integrals involving sin(θ), cos(θ), and tan(θ) raised to complex powers are provided as examples.

Areas of Agreement / Disagreement

Participants express differing views on the possibility of finding closed form solutions, with some asserting it is not possible while others propose that hypergeometric functions may provide a solution. The discussion remains unresolved regarding the feasibility of explicit solutions.

Contextual Notes

There is a lack of consensus on the methods available for solving these integrals, and the discussion includes various assumptions about the nature of z and the functions involved.

eyesontheball1
Messages
31
Reaction score
0
For any integral where the integrand is of the form f(θ)^z, with z a complex number, and f(θ) = sin(θ), cos(θ), tan(θ), ... etc., θ being either real or complex. Is it possible to explicitly solve for an antiderivative? I'm not aware of any such way I could use residues/series representations here, and I've tried all kinds of substitutions for integrals of this type; in particular, of [sin(θ)]^z, z being a complex constant. Thank you in advance!


David
 
Physics news on Phys.org
No, even if z is real (not rational).
 
eyesontheball1 said:
For any integral where the integrand is of the form f(θ)^z, with z a complex number, and f(θ) = sin(θ), cos(θ), tan(θ), ... etc., θ being either real or complex. Is it possible to explicitly solve for an antiderivative? I'm not aware of any such way I could use residues/series representations here, and I've tried all kinds of substitutions for integrals of this type; in particular, of [sin(θ)]^z, z being a complex constant. Thank you in advance!


David

Hi!

most of them can be expressed in terms of hypergeometric functions.
 
Would you mind showing exactly how such an integral can be expressed via a hypergeometric function? Thanks in advance!
 
Great, thank you JJacquelin!
 

Similar threads

  • · Replies 8 ·
Replies
8
Views
4K
  • · Replies 21 ·
Replies
21
Views
4K
  • · Replies 12 ·
Replies
12
Views
3K
  • · Replies 15 ·
Replies
15
Views
2K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K