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Old 2008-04-18, 00:19   #1
roger
 
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Default Σ summation increments

How is a summation expressed when the increment from one value in an expression to another is greater than one?

For example, if I wanted the summation of a seried with the increment of the variable values being two, would I have to write earlier in the expression: let [variable] = 2*x ?

I don't know how to do TEX code, so here's a picture:

Thanks!
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Old 2008-04-18, 01:48   #2
R.D. Silverman
 
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Quote:
Originally Posted by roger View Post
How is a summation expressed when the increment from one value in an expression to another is greater than one?

For example, if I wanted the summation of a seried with the increment of the variable values being two, would I have to write earlier in the expression: let [variable] = 2*x ?

I don't know how to do TEX code, so here's a picture:

Thanks!

\sum_{n=1}^{\infty} \frac{1}{(2n-1)} would be over all odd numbers

replace (2n-1) for even numbers with just (2n)
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Old 2008-04-18, 07:04   #3
Orgasmic Troll
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Quote:
Originally Posted by R.D. Silverman View Post
\sum_{n=1}^{\infty}  \frac{1}{(2n-1)} would be over all odd numbers

replace (2n-1) for even numbers with just (2n)
(threw in tex tags)
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