[Tugindia] Bold math

[renu at aero.iisc.ernet.in]

Dear TUG,

Can somebody help me in getting the following

$X_{\alpha, \bm{$\beta$}}$

i.e I wanted the subscript $\beta$ in bold. 

I am getting normal $\beta$ in boldmath using 
\bm{$\beta$} but not the one which comes subscript.  


Thanks in advance

Renu


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