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That was my understanding of what the $ character does, but when they're not used the output looks wrong (see my attached example, line 3 - it's supposed to be a sum of products - and compare it to the negative numbers inside of the matrices). Have you any idea how I can get nice negative numbers ...

Having seen here about the differences between various uses of hyphens, I thought that was the correct way to input negative numbers.

Edd

Thanks for that, it's fixed the problem with the not-equals, but I still can't get negative numbers outside of a matrix using the $-2$ type notation. Using -2 format i get nasty look subtraction operators that are incorrectly spaced.

Edd

I'm new to using LaTeX and am having a few minor issues with mathematical formulae, specifically with negative numbers (using eg. $-7$) and not equals (ie. $\neq$). Am I using them incorrectly. Attached is my .tex file, but what I think is the important bit is below:
\begin{eqnarray*}
\begin ...