I would like to know if it is possible to force the equation to be closer to the operation sum? When there are a lot of subscript under the sum operator, it tends to pouch the equation to the right, and this is not very aesthetic.

```
\sum_{n\in N_{-i}}\sum_{\substack{j \in N_{-i} \\ j \neq n}}v_j
```

## Best Answer

The first part of following code shows the problem you mentioned and the "standard" possible solutions for a single sum: using a

`\makebox`

or using`\mathclap`

(from the`mathtools`

package).Next I present your concrete example and several variations; now, only using \mathclap makes things worst since the subscripts overlap; using \mathclap and adding some space between the sums could be an option, but I think the best solution would be the last one in which the amount of symbols used in the subscripts has been reduced: