I noticed that the commands \left\| ... \right\| don't always generate brackets of the same size, even when the content is the same. Example:
The code \frac{\left\|A^{-1}\right\|}{\left\|A^{-1}\right\|}
yields this:
Clearly, the bars are larger in the numerator, although the code is identical. Is there a nice way to prevent this?
\bigl \bigr
or\Bigl \Bigr
instead.\left(\sum_j \right)
, you'll also often run into problems when used in text mode, they grow too large and disturb line spacing.