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May 10 at 19:48 comment added PrincessEev In the very first equation, $n$ is just a generic parameter (perhaps limited to a certain domain). You can replace it throughout the equality with an appropriate value, and then the new equality would still hold.
May 10 at 10:55 vote accept zeynel
May 10 at 10:55 comment added zeynel Thanks for the great answer. It covers all the questions that I had. But while reading your answer I noticed something else. In the first integral we have the summation index $n\in\mathbb{N}$ but we don't have the summation sign. We introduce the summation sign in the next expression. So does $n$ have meaning in the first expression? Or is that a provisional expression? Thanks again.
May 9 at 5:55 history answered PrincessEev CC BY-SA 4.0