- #1

arcTomato

- 105

- 27

- TL;DR Summary
- I can't understand how to derive fourier transform(described by Σ).

Dear all.

I can't understand how to derive Eq.(2.3a).

Fourier coefficients, ##A_j## and ##B_j## are described by summation in this paper as (2.2). I think this is weird.

Because this paper said "In this section 2.1 ,the Fourier transform is introduced in very general terms".

and I understand Fourier coefficients as integral.( I think integral version is more general than ##Σ## version.) so I'm confused.

I would like to ask you how to derive (2.3a) in this paper( in ##Σ## version).

(this is the paper I read

I can't understand how to derive Eq.(2.3a).

Fourier coefficients, ##A_j## and ##B_j## are described by summation in this paper as (2.2). I think this is weird.

Because this paper said "In this section 2.1 ,the Fourier transform is introduced in very general terms".

and I understand Fourier coefficients as integral.( I think integral version is more general than ##Σ## version.) so I'm confused.

I would like to ask you how to derive (2.3a) in this paper( in ##Σ## version).

(this is the paper I read

**Fourier_techniques.pdf)**