# Einstein summation notation, ambiguity?

• B
Hiero
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?