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Can someone please tell me how do I write comments involving mathematical techniques as it appears in text books. Say for eg. I wish to write summation of q_i over all integral values of i as it would have appeared in a math text book having a sigma notation and everything...

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    $\begingroup$ You can see a lot of examples by clicking on “edit” to see the source of existing posts. Press Escape or Back or close the browser tab to abandon the edit. $\endgroup$ – Gilles 'SO- stop being evil' Sep 9 '14 at 12:46

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