What does a ellipsis directly following a summation mean?

[ektrules]

I've never seen this notation before. What does the ellipsis right after the first summation mean:
$$\begin{equation}<br /> \label{aixi_eq}<br /> a_t^* = \arg\max\limits_{a_t}\sum\limits_{o_t r_t} \dots \max\limits_{a_{t+m}}\sum\limits_{o_{t+m} r_{t+m}}[r_t + \dots + r_{t+m}]<br /> \sum\limits_{q:U(q,a_1...a_{t+m})=o_1 r_1 ... o_{t+m}r_{t+m}}2^{-\ell(q)}.<br /> \end{equation}$$

 

[mathman]

My guess: a string of summations with a_t+k with 0<k<m.

 

[ektrules]

My guess: a string of summations with a_t+k with 0<k<m.

That's it, thanks.