- #1
SergeantAngle
- 2
- 0
Hi
I have a textbook which uses the notation:
[itex]\sum\limits_{i\neq j}^N a_i a_j[/itex]
I can't find anywhere what this actually means. Is it equivalent to:
[itex]\sum\limits_{i}^N \sum\limits_{j}^N a_i a_j[/itex]
where j can't equal i?
Thanks.
I have a textbook which uses the notation:
[itex]\sum\limits_{i\neq j}^N a_i a_j[/itex]
I can't find anywhere what this actually means. Is it equivalent to:
[itex]\sum\limits_{i}^N \sum\limits_{j}^N a_i a_j[/itex]
where j can't equal i?
Thanks.