Expressing 2*4*6*8*10*etc. mathematically

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SUMMARY

The discussion focuses on expressing the product of even numbers, specifically 2, 4, 6, 8, and so forth, mathematically. The user seeks assistance in writing a power series expansion for a function, ultimately leading to the expression of the product as \(\prod_{n=1}^{\infty} 2n\). The conversation highlights the confusion surrounding the mathematical representation of this infinite product and its implications.

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Homework Statement


This doesn't seem too hard but I can't figure it out. I'm trying to write out a power series expansion for a function, and after a bit of math I've got: f\left(x\right) = 1 - \frac32 + \frac98 - \frac{27}{48} + \frac{81}{384}... = 1 - \frac{3^1}2 + \frac{3^2}{2*4} - \frac{3^3}{2*4*6} + \frac{3^4}{2*4*6*8}...


Homework Equations


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The Attempt at a Solution


I just don't know how to express 2*4*6*8...etc. mathematically. Help please?
 
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Hint: 2*4*6=23*1*2*3 :wink:
 
Damnit, I knew it'd be something simple... =P Well, thanks for the help!
 
ƒ(x) said:
I believe what you're looking for is...

\prod 2x from 1 to infinity

Why would you think this?:confused:

\prod_{n=1}^{\infty} 2x=\infty
 
gabbagabbahey said:
Why would you think this?:confused:

\prod_{n=1}^{\infty} 2x=\infty

Its late and I'm tired. Dont mind me.

I thought he was just asking how can you express 2*4*8... (I only read the title)
 

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