I am defining a trace symbol as follows:


but now I would like to be able to insert a summation variable below. However \Tr_x places the subscript x on the side:

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I want the subscript below, like this:

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I know I can achieve this by typing \underset{x}{\Tr}, but that's a long command. Is there a way to have the subscript placed below by default whenever I use \Tr? Or another way of defining the operator/command that achieves this easily?


In order to get behavior like with \lim use the starred version


Remember typeset under is only seen in display math, in text style math it is still written on the side as it should or it would disturb line distance.




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