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How can I put a question mark above a less-than-or-equal-to symbol(\leq) in LaTeX?
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To put a tilde over a letter, we can use either \tilde or \widetilde . As for which one to use in which situation, compiling a document with the following as its part can help comparison. To put a bar over a letter, we can use either \bar or \overline .
Use the \mathord command to declare an ordinary mathematical symbol, as in: t = \mathord{?} \newcommand{\que}{\mathord{?}} so that you can use it easily (and be true to the semantic ideals of LaTeX, etc.
Not equal. The symbol used to denote inequation (when items are not equal) is a slashed equal sign ≠ (U+2260). In LaTeX, this is done with the "\neq" command.
You can use stackrel:
\begin{equation} 2 \stackrel{?}{\le} 3 \end{equation} \end{document} Or, if you use the amsmath package, you can use overset as follows:
\documentclass{article} \usepackage{amsmath} \begin{document} \begin{equation} 2 \overset{?}{\le} 3 \end{equation} \end{document} 
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\stackrel{\text{\tiny ?}}{=}
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