How to enter Greek characters in Emacs

Question

This page indicates that Greek letters can be inserted into Emacs by using M-i. However, Emacs 23.2.1 in a Debian Squeeze variant inserts the \"tab\" character when

Answer 1

M-x set-input-method RET TeX will allow you to write e.g. \beta to get β, \sum or \Sigma to get Σ etc.

It can be toggled on and off with toggle-input-method, bound to C-\ and C-<.