[texhax] ?

[File Store]

I have written documents with LaTeX long time ago and at that time I put
prime over a summation like

$$\sum_{k=1}^{\infty}\!\strut'$$

in many differetn types they all look same with no spacing problem. I am
sure that I did not use any adjustment comend like \! \strut etc.

I feel like it might be the case if there is a special comend to type the
derivate. It might work out if it is the case.

I am pretty sure there must be a way to type it normally, since all wrote
before look perfect with no space problem.
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