Matrix notation In xaml

Question

Hi everybody here,
First of all, I apologize for my poor english vocabulary and practice, I hope this will note let you go far away from this post !!! ;)
Well here's the point:
I'd like to get FlowDocument with matrix element representation inside. For exemple, I've got a matrix A which elements can be represented with 2 indices, one up, one down (as in many matrix books I guess ...)
I know the typography property which make it possible to have those 2 indices, but it doesn't  work when I want them to be one on the other one (I mean that one is upper left, the other down right, and i want them to be on the same level)

First of all, am I clear enough so I can get an answer from anyone ???....

Thanks,
 
Bye,

Vincent