Letter with ' (and correct spacing)

Question

I am struggling with a problem I can't even name properly: I'm writing an article about an object A as well as its slightly different variant A'. I am wondering what character/symbol and/or spacing magic I need for the '.

I started by simply using ' but this gives me an pretty nasty space between the A and the '. Then I tried to correct that with A\kern-0.1em' Unfortunately this is not consistent as things get stretched around to fill the page (in some cases there's just as much space as without kerning).

I also read through the giant symbol archive but at a glance I couldn't find anything appropriate. Well, I didn't know what I'm looking for so maybe I missed it. Surely this type of notation is quite common?

Is there any better way to achieve this? Honestly I don't even know if an apostrophe is the right kind of dash for this kind of labeling. So any suggestions for coding magic or new symbols are welcome.

Many thanks.

Answer 1

try this:

\documentclass{article}
\begin{document}
$\mathrm{A}' \quad \mathrm{X}' \quad
 \mathrm{A}\!' \quad \mathrm{A}\mkern-2mu' $
\end{document}

the large gap between the A and the prime is because of the shape of the A. if you have\mathrm{X}' the spacing is much nicer. so "backing up" the prime is what is needed. a negative thinspace, \!, is too much, but \mkern-2mu may be just about right. (a thin space = 3mu.)

Answer 2

If you do A' in text mode, you get an A followed by a single right quote (a separate symbol). Use math mode to attach a prime to a symbol.

\documentclass{article}
\begin{document}
A' \quad $A'$
\end{document}