Question: n-dimensional sums ?

I want to do a very high-dimensional sum.

Particularly, this sum, where each of those indices can be either 0 or 1:


I started doing something like:



But it seems that there must be a better way (one in which I can genarlize to n dimersions). Is such a thing possible in maple ??


R is a function of all of all components of a and b.


Also, is there a way I can type tex strings in this forum, instead of posting the pdf like I did ??

In PhysicsForums we just do <tex> and </tex>





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