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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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closed as too broad by Normal Human, 91500, tired, SchrodingersCat, Cm7F7Bb Nov 6 '15 at 13:33

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

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

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

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