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I want to do something like this:

   Hom_{K\cap {}_a^bK}  

But there seems that the _a^b is on the \cap and not attached to the K.

How might I do this right?

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@nrpeterson: I did take a look at that, but I can't get that to work. Can you show me in an answer how I might do what I am trying to do? – Thomas Jun 13 '13 at 14:42

None of the mentioned packages would give a good result in this case, because TeX suppresses space around binary operations in subscripts.

A good solution for this particular case seems to be

   \Hom_{K\cap \,\leftidx{_a^b}{\!K}{}}

The \, pushes right the right operand a bit, so to separate it from the intersection symbol. The K would however be too detached from the prescripts, so I add a small correction.

enter image description here

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