[mickeyp]

I think you mean C-u C-\ and then change the input type to tex.

There are other ways of inputting digraphs: C-x 8 RET lets you enter the name of any unicode symbol.

I wrote about the many ways of inputting digraphs and unicode here:

http://www.masteringemacs.org/articles/2010/10/13/diacritics...

[pseut]

You're right, thanks. But C-u doesn't seem to be necessary, unless I have a strange setup.