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-   -   Σ summation increments (https://www.mersenneforum.org/showthread.php?t=10215)

 roger 2008-04-18 00:19

Σ summation increments

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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!

 R.D. Silverman 2008-04-18 01:48

[QUOTE=roger;131803]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![/QUOTE]

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

replace (2n-1) for even numbers with just (2n)

 Orgasmic Troll 2008-04-18 07:04

[QUOTE=R.D. Silverman;131807]$$\sum_{n=1}^{\infty} \frac{1}{(2n-1)}$$ would be over all odd numbers

replace (2n-1) for even numbers with just (2n)[/QUOTE]

(threw in tex tags)

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