A space between the tilde mark and a letter is relatively higher in exponent or subscript in math mode. For instance, the tilde mark appears differently spaced over the letter z in the two following situations: $B_{\tilde{z}}$ and $\tilde{z}$. How to solve this problem?

Here is a MWE:








enter image description here

  • 2
    Please provide MWE.
    – user31034
    Nov 19 '13 at 15:49
  • 1
    Welcome to TeX.SX! Please add a minimal working example (MWE) that illustrates your problem. In your case, please also tells which engine (latex, pdflatex, xelatex or lualatex) you are using to compile the document Nov 19 '13 at 15:56
  • A tip: If you indent lines by 4 spaces or enclose words in backticks `, they'll be marked as code, as can be seen in my edit. You can also highlight the code and click the "code" button (with "{}" on it).
    – Herr K.
    Nov 19 '13 at 18:43
  • I Use TeXshop but the problem originates from the "accents" package. I use the command \underaccent{...} and another command for similar result would be useful in replacement.
    – Roy
    Nov 19 '13 at 18:50

Quoting the accents manual:

nonscript single

These package options are intended mainly for speeding up the typesetting of document. The algorithm used here is recursive and very slow; although in fast processors that is not felt, in slow system that could be very annoying.

single If you are interested only in \accentset. Accents are not reimplemented.

nonscript If you intend to use multiple accents in text and display modes only.

The correct phrase should be ‘in text and display styles only’; the meaning is that with the nonscript option accents will not work correctly when used in subscripts.

So remove the nonscript option and you'll get

enter image description here

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