[texhax] problem with align environment

[Hartmut Henkel]

On Wed, 18 Feb 2009, Don Gingrich wrote:

> Trace the operations of the following example, and make sure that you
> can relate each operation to the rules above.
>
> \begin{align*}  % [482]
>         Z &= \overline{(\overline{A}.\overline{B} + C)} + (B.C) \\
>           &= (\overline{\overline{A}.\overline{B}}.\overline{C}) + B.C    \\
>           &= (\overline{\overline{A}} + \overline{\overline{B}}).$\overline{C} + BC \\

in the line above there is a $-sign that doesn't belong there.

>           &= (A + B).\overline{C} + B.C \\
>           &= A.\overline{C} + B.\overline{C} + B.C \\
>           &= A.\overline{C} + B.(\overline{C} + C)\\
>           &= A.\overline{C} + B \\
> \end{align*}  % [490 ]

Regards, Hartmut