Latex superscripts, subscripts and curly braces

[Hans Lonsdale]

I am using latex-mode, which is able to shift superscripts upwards, and 
subscripts downwards, using a smaller font.
For simple cases the shifting works well.  But for industrial applications 
where terms get to be quite long, it basic
idea does not work well.  The problem becomes significant when grouping terms 
using curly braces "{}". 

The superscript, subscript, and braces signs ( i.e. ^ _ {} ) are retained.

a^{11} a_{21}

I would very much like to have the additional capability of removing the 
symbols ^ _ {} when displaying, to get

a11 a21

where only the shift and font decrease are shown.

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