Date: Mar 8, 2007 7:15 AM
Author: Mike Hillen
Subject: Warranty Activation Headquarters

Hi my name is Mike and i'm working at Warranty Activation Headquarters.

Students find it difficult to learn how to use bound variables
correctly. They may allow variable clash. They may not understand that
which bound variable it is does not matter (except for variable clash); thus
\int_2^5 x^2 dx and \int_2^5 t^2 dt are the same by their form. They may
move a bound variable out of its binder, for example changing \sum_{i=1}^n
i^2 to i\sum_{i=1}^n i (which makes it easy to ``solve''!). And they may
substitute for it, although in my teaching experience that is uncommon. 

Does anyone know of any math ed studies that have been done on this?

Thanks,
Warranty Activation Headquarters