I would like for sympy to simplify the following expression:

Meaning I would like to explicitly see the summation and differentiation 
applied such that I can substitute in values for tau_ij and see how they 
affect the equation.

I only found one StackExchange post regarding summation convention in sympy 
The solution offered in this stackexchange post really shows how limited 
sympy is in this regard. I also found a package built on sympy that 
specializes in working with einstein summation convention 
https://github.com/LindaLinsefors/EinSumConv but it seems like this was 
begun 3 years ago and discontinued. 

What options exist for users who regularly need to expand expressions using 
the summation convention? I feel like this should be a part of any symbolic 
math package...

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