[R] double subscripts with Greek letter

[Jeff Shane]

Hi all,

I have a question which seems trivial but simply cannot figure out its
solution.

I want to type A_{\alpha,\beta} in the title of a plot. Uwe once pointed
out a solution

expression(A[alpha*beta])

But the output of the above command does not include the "," in the
subscript. Is there a way to solve my question? Thanks so much!

Regards,
Jeff

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