Long ago, I came across a text editor function that replaced the word 'lambda' with the character 'λ'. I would like to do this in emacs. My preferences:
I would like to activate this function in certain modes only (activate it for Scheme-mode but turn it off for C-mode for example).
At work I still use an older version of emacs, so the solution should work for emacs22 and emacs23.
How should I proceed?