problems with emacs lisp function

[Enrico Campanelli]

hallo everybody!

 

I've emacs-20.4-4 on my linux redhat 6.1 system, and I tryed to define a simple lisp function to insert {} in a document with emacs in tex mode. The lisp code in the .emacs file is:

 

(global-unset-key "\C-d")

 

  (defun parentesigraffe()

  (interactive)

  (insert "{}")

  (backward-char 1)

)

 

(define-key tex-mode-map "\C-dg" 'parentesigraffe)

 

 

The problem is that when I run emacs, I get the following error message:

 

"symbol's value as variable void: tex-mode-map"

 

The unsetting of C-d sequence works fine but C-d g doesn't.

 

It means that it don't understand the string "tex-mode-map". I tryed the following:

1) I tryed to put c-mode-map, lisp-mode-map but i get the same error

2) I tryed to put nothings  but I get the message that there are too few arguments

3) in the past I have had linux redhat 5.0 with emacs-20.2-4 and this lisp code worked fine. So I've reinstalled that older version of emacs but it dosen't works anymore :-(( So I've reinstalled the newer one.

4) I have given a lot of punch to my PC (.....I'm joking!!)

 

So, where can be the problem?  HELP me please, I'm going to destroy my PC!!!!!

 

Thanks a lot to all people that have read this message!!