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I really don't know how to write that 'Y' in latex. I have tried many methods but I didn't succeed. Any help will be appreciated.

  • I changed the tag as this clearly isn't related to biblatex. Are you talking about the Y, or the Y with the underline? – Johannes_B Aug 16 '15 at 11:07
  • Y with the underline – rhondagarcia Aug 16 '15 at 11:08
  • 1
    \underline{Y} – Sigur Aug 16 '15 at 11:10
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If you don't want the underline to extend that far over the symbols' “boundaries”, you might want to consider using the accents package for the macro \underaccent{<accent>}{<glyph>}. See the following MWE for an illustration:

\documentclass{article}
\usepackage{accents}
\begin{document}
$\underaccent{\bar}{Y}$ vs.\ $\underline{Y}$
\end{document}

enter image description here

1

I would start with

\underline{Y}

in either inline-math or displaystyle-math mode.

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