TeX output under derivabbrev : true

> Here is a quick (and barely tested) hack.
[...]

It won't work if the expression being differentiated is not a symbol,
though.

(C3) 'diff(u[0],x,2);
(D3) 				     u
				      0
				       x x
(C4) tex(%);
$$
*** - GET: ((|$u| SIMP ARRAY) 0) is not a symbol

Thinking about it...

Wolfgang