Even in display math I guess that there is too little space between the top horizontal line of the radix symbol and the horizontal line of a \frac. How can I control that vertical space?

I have a related question. When using a radix, the horizontal line becomes to close to the argument of the \sqrt. We can try to fix that by using \sqrt{\mathstrut x^2 + 3 x} instead of \sqrt{x^2 + 3 x} but now the vertical space becomes too grandiose! How can I fix and finetune it very? I have the impression that these problems are also related by the choice of the font. I see this problem more pronounced using Lucida math fonts as opposed to Times math fonts. But anyway, it is good to know how to finetune such things in principle.

closed as unclear what you're asking by Andrew Swann, user31729, Guido, Henri Menke, Paul Gaborit Dec 29 '14 at 10:13

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • Welcome to TeX.SX! Please help us to help you and add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to give you a hand. Help them help you: remove that one hurdle between you and a solution to your problem. – yo' Dec 3 '14 at 11:16
  • You can a;ways use \raisebox to fine tune the vertical spacing (above and below). – John Kormylo Dec 3 '14 at 13:33