The vim editor on my Kubuntu 13.04 laptop seems to have some advance feature for latex edting, i.e. it can convert latex symbols to unicode chars on the fly and hide the sourc
This functionality is provided by Vim's "conceal" feature.
Vim's TeX plugin takes advantage of "conceal" if you have set 'conceallevel' to 2. See :h ft-tex-syntax.
Leave 'conceallevel'
at its default value of 0 to disable concealing.
Alternatively, put the following line in your vimrc.
let g:tex_conceal = ""