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!
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
closed as too broad by Meta, USER91500, 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.