When using subscripted variables in a function, I get that i first need to symbolize them, to be able to use them. Like in picture 1.
Now I would like to build a summation in this function where the summations runs over the subscripts, (like in picture 2). As you can see in picture 2, the function doesn't do anything with the given values in the case of summing over the subscripts.
I hope someone can help me with this problem.
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