[OS X TeX] A little help needed (math formula problem)

[Joe Java]

Thanks, this solves the problem of the errors.

> Hi, 
> looks like multirow doesn't work too well with array environments. But I got it to work by replacing the multirow part of your array with this:
> 
>        \multirow{2}{*}[1.4ex]
>        {
>          \text{$\displaystyle
>          \left(
>            \begin{array}{c}
>              b_1 \\
>              b_2 \\ [0.3ex]
>              b_3 \\
>              b_4 \\
>            \end{array}
>          \right)
> $}
> All I did was switch to text mode in the array, and this was enough to fool multicol into behaving properly. Within that, I switched back to math for the vector column.
> 
> Cheers,
> Jens
>