[texhax] some math command didn't working properly

[Philip G. Ratcliffe]

> when I use marvosym package, why some math command
> didn't working properly like this :
>
> \Longrightarrow produce =:
> \Rightarrow produce :
>
> This problem vanish when I didn't use marvosym package.
> What must I do if want work with marvosym package and
> I want to produce that math commands?

I can't reproduce this error - maybe there is some intereference ith another
package.  As is often suggested here, you should provide a minimal example.

Cheers,  Phil Ratcliffe