Talk:Vectors

I am getting an error in red

"Failed to parse(PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \hat\mathbf{b}\,"

on this page, I have no idea to fix it, do you? 134.148.5.104 Handsofftibet (discuss • contribs) 01:27, 13 October 2011 (UTC)