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Sorry for this simple question, but I never learned nothing about double sums )= , I only know what they are . But finally I had a problem where I need to know something about this, wondering if anyone has material to learn the basics, such as the product of summations, I can write as a double sum and vice versa, learn to turn the indices, etc. Order to gain a little more fluent in basic properties of these sums, and not have to always be deducting things that everybody knows) = Not only with double of multiple sums , also with multiple series, But Only something basic to learn the typical properties )= only this. Thanks!

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Iverson brackets can be a great aid when changing summation order for multiple series. –  J. M. Nov 28 '11 at 18:59
    
So, have you found my answer helpful? Is there some way in which it is lacking? Speak up - no one can help you if you maintain silence. –  Gerry Myerson Dec 1 '11 at 6:32

1 Answer 1

This, starting around page 11, looks pretty good to me.

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