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thanks a lot, it works great!

Hi,

I'm trying the following:

$\{M_{a'b'}\}$\tiny{$_{\begin{array}{l}a' \geq a \\ b' \geq b\end{array}}$}

for having an array in subscript composed of two rows: a' >= a and b' >= b next to {M_{a'b'}}.

is there a better way to do that??? cause this way causes too many problems:

how can I avoid ...