20080418, 00:19  #1 
Oct 2006
2^{2}·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! 
20080418, 01:48  #2  
"Bob Silverman"
Nov 2003
North of Boston
2^{3}·3·313 Posts 
Quote:
\sum_{n=1}^{\infty} \frac{1}{(2n1)} would be over all odd numbers replace (2n1) for even numbers with just (2n) 

20080418, 07:04  #3 
Cranksta Rap Ayatollah
Jul 2003
641 Posts 
