Ernesto Posse writes:
> Hello. I have an issue with the use of \not in math mode, but I am not
> sure if the poblem is with LyX or LaTeX itself.
>
> When I try to write "aRb" with the R negated, the diagonal which is
> supposed to go over the R does not appear in the right place. I've
> tried each of the following, both in ERT and using LyX's math
> interface:
>
> $a\not Rb$ result: big space between a and R, / just a little over R.
> $a\not R b$ result: same
> $a\not{R}b$ result: same
> $a{\not R}b$ result: smaller space between a and R, but / still not
> completely over R.
> $a{\not{R}}b$ result: same
>
> It seems that the only way to make it look right is with negative
> spaces, but that seems like an ugly hack. Is there any way to negate
> the "right" way?
Note that \not is supposed to negate math relations, so I think
that you can get what you want by using
$a\not\mathrel Rb$
Also note that you will get automatic spacing around your new math
relation. If you don't like that, then use
$a{\not\mathrel R}b$
HTH
--
Enrico
