- #1

user15197573

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- TL;DR Summary
- Series property

Can someone help me understand why what I wrote is correct? That is: If I have a sequence with double indices and if the summation of the elements modules of this sequence converges (less than infinite) than it does not matter how I make this sum (second line) they are going to be always the same. Thank you.

edit: Guys, I've just found the answer to this question in another post but I don't know how to delete this.

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