TeX source:

q_{i}(t)=\exp \left(-n *\left(f\left(x_{i}, t\right)-f\left(x_{b e s t}, t\right) /\left(\sum_{i=1}^{m}\left(f\left(x_{i}, t\right)-f\left(x_{b e s t},\right.\right.\right.\right.\right.))) \; \forall i= 1,...,m