Syntax for math-insert

[Paul A. Rubin]

Hi all,

I think this is a bug, in which case I'll add a ticket, but first I want 
to make sure I'm not missing something fundamental about the syntax of 
math-insert.  Should 'math-insert x_y' insert $x_y$, or do I need 
something in front of the x and/or after the y?  As it stands, 
'math-insert x_y' inserts the subscript y but not x; 'math-insert x_y;' 
inserts $x_y;$.  Bug or syntax error?

Thanks,
Paul