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 2008-04-18, 00:19 #1 roger     Oct 2006 22×5×13 Posts 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! Attached Images
2008-04-18, 01:48   #2
R.D. Silverman

Nov 2003

746010 Posts

Quote:
 Originally Posted by roger 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)

2008-04-18, 07:04   #3
Orgasmic Troll
Cranksta Rap Ayatollah

Jul 2003

64110 Posts

Quote:
 Originally Posted by R.D. Silverman $\sum_{n=1}^{\infty} \frac{1}{(2n-1)}$ would be over all odd numbers replace (2n-1) for even numbers with just (2n)
(threw in tex tags)

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