Aligning 3 Columns In LaTeX Eqnarray
Answer : You should avoid eqnarray . See \eqnarray vs \align. I'd recommend using align or alignat from amsmath package: Both align and alignat provide pairs of rl alignment columns. So, I used a && before the \Leftrightarrow assuming that the next column was to be r ight aligned. Code: \documentclass{article} \usepackage{amsmath} \begin{document}\noindent Using \verb|align|: \begin{align} \int ( D \frac{d^2 P(x)}{dx^2}-\frac{d}{dx}[u(x)P(x)] ) &= \int 0 &&\Leftrightarrow \\ D \frac{d}{dx} P(x) - u(x)P(x) &= C &&\Leftrightarrow \\ D \frac{d}{dx} P(x) - K_0P(x) - \frac{K_1}{x}P(x) &= C &&\Leftrightarrow \\ \frac{dP(x)}{dx} - k_0P(x) - \frac{k_1}{x} P(x) &= C, \end{align} Using \verb|alignat|: \begin{alignat}{4} \int ( D \frac{d^2 P(x)}{dx^2}-\frac{d}{dx}[u(x)P(x)] ) &= \int 0 &&\Leftrightarrow \\ D \frac{d}{dx} P(x) - u(x)P(x)
