[Tex/LaTex] Math operator with indices and limits

Question

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!

Answer 1

I would try with sideset from the amsmath package:

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