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I have several \bigoplus operators, indexed by i from 1 to d, using \bigoplus_i

Now, I want to use these operations on terms indexed by j from 1 to d. My first attempt to write this was \mathop{\bigoplus_i}_{j=1}^d which puts all subscripts and superscripts to the right.

I want the 'i' to be a subscript down and to the right, but I want 'j=1' to appear beneath the operator and 'd' to appear above. I've tried a few different ideas (using '\displaystyle') without getting what I wanted.

Finally, \mathop{\bigoplus{}_i}_{j=1}^d worked; but I'm not sure the spacing is ideal. Any suggestions? Thanks!

2 Answers 2

17

I would try with sideset from the amsmath package:

\begin{equation}
  \sideset{}{_i}\bigoplus_{j=1}^{d}
\end{equation}

result

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  • Thank you! 'sideset' seems to be exactly what I needed. It puts the subscript at just the right level for the 'bigoplus'. Commented Feb 9, 2011 at 16:53
6

try this one:

\[ \bigoplus\limits_{j=1}^d{}_i \]

enter image description here

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  • Thanks; that also works. Comparing your solution with Yuppie's and mine, I think my solution and yours are equivalent, putting the subscript at the default subscript height. Yuppie's solutions puts the subscript lower and closer to the 'bigoplus'. Commented Feb 9, 2011 at 16:58

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