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## Main Question or Discussion Point

Hello everybody

I'm very much interested in the thread about "Feynmans Calculus" (having read the books, too). The problem is I don't understand quite some of the stuff, because I don't have the necessary fundamental knowledge.

So I thought to confront you with some lower level questions:

How do you solve this: [tex]\int\ e^{(-x^2)} dx[/tex] ?

It seems that [tex]\int_{-\infty} ^\infty e^{(-x^2)} dx=\sqrt{\Pi}[/tex]. Why is that?

I honestly have no clou.

I would be very thankful if somebody could explain this to me (then I could also continue to see wether the rest of my questions still makes sense...).

Best regards and thank you in advance

cliowa

I'm very much interested in the thread about "Feynmans Calculus" (having read the books, too). The problem is I don't understand quite some of the stuff, because I don't have the necessary fundamental knowledge.

So I thought to confront you with some lower level questions:

How do you solve this: [tex]\int\ e^{(-x^2)} dx[/tex] ?

It seems that [tex]\int_{-\infty} ^\infty e^{(-x^2)} dx=\sqrt{\Pi}[/tex]. Why is that?

I honestly have no clou.

I would be very thankful if somebody could explain this to me (then I could also continue to see wether the rest of my questions still makes sense...).

Best regards and thank you in advance

cliowa