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If I see ##f(x_ie_i)## I assume it means ##f(\Sigma x_ie_i)## (summing in the domain of f) but what if I instead wanted to write ##\Sigma f(x_ie_i)## (summing in the range)?
Is there a way to distinguish between these in Einstein’s summation notation?
Is there a way to distinguish between these in Einstein’s summation notation?