# How to change position of symbols that are moved by transposition sign in equation?

I have equation

\begin{align}
\textbf{P}(k+1|k) = \textbf{F}(k)\textbf{P}(k|k)\textbf{F}^T(k) + \textbf{Q}(k)
\end{align}


where the sign of transposition \textbf{F}^T makes second the time symbol (k) goes much more from matrix \textbf{F}. How to make it closer? Ideally \textbf{F} and (k) should be in same distance in case of \textbf{F}(k) and \textbf{F}^T(k).

You could just insert \!, which gives you a small "negative" horizontal space.
\documentclass{article}
$$\textbf{P}(k+1|k) = \textbf{F}(k)\textbf{P}(k|k)\textbf{F}^T\!(k) + \textbf{Q}(k)$$

By the way, the eqnarray environment is deprecated nowadays. For this use, I think equation would serve you well.
• I would also suggest making a macro for the |. | are used for so many different things, which makes it a nightmare to distinguish each usage from each other. – daleif Jun 4 '13 at 8:35