What does it mean to have a subscript and superscript ?
I came across this equation from a paper:
$$ \phi(w,\xi) = \mathrm{min} \frac{1}{2}\sum_{m=1}^{k}(w_m \cdot w_m) + C\sum_{i=1}^{\gamma}\sum_{m \neq y_i} \xi_i^m $$
I'm having trouble understanding what is going on in the last summation.