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

[Joe Java]

Thank you this fixed the errors.

> 
> \multirow uses *text* – and maths is no text. This cures your problem:
> 
>         \multirow{2}{*}[1.4ex]
>         {$
>           \left(
>             \begin{array}{c}
>               b_1 \\
>               b_2 \\ [0.3ex]
>               b_3 \\
>               b_4 \\
>             \end{array}
>           \right)
>         $}
> 

  This works. 
> How about setting the bigger 0 as non-maths: $\Large 0$ ?
> 

Now I want to position the zero vertically.

How do I adjust one character up or down (vertical alignment),
without moving any other characters?