Re: tetex bug, array environment

burton rosenberg <[email protected]> writes:

> I think this is a bug. If it's in Tex itself
> Donald K. owes someone a dollar. :-)

I think \\ can take an optional argument which specifies how much
vertical whitespace to insert. Therefore it wants a unit of measure in
\\[0,1], for example \\[0,1pt]. 

> \documentclass[11pt]{article}
> \begin{document}
>
> \[
> f(x) = \left \{
>        \begin{array}{lll}
>       [4,5] & x\in [0,2) & \\
> % BEGIN SECTION OF INTEREST
> % bug
> %
>         [0,1] \cup [4,5] & x\in[2,3] & \\
>         [0,1] &  x \in (3,5] & \\
> %
> % error reads:
> %! Illegal unit of measure (pt inserted).
> %<to be read again> 
> %                   >
> %l.14         [0,1]
> %                   \cup [4,5] & x\in[2,3] & \\
> %
> % bug workaround
> %    {}  [0,1] \cup [4,5] & x\in[2,3] & \\
> %    {}  [0,1] &  x \in (3,5] & \\
> %
> % END SECTION OF INTEREST
>        \end{array}
>        \right.
> \]
>
> \end{document} 
>
> ==============================================
>

-- 
Emil Hedevang Lohse <http://home.imf.au.dk/emil/> 

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