For instance, using the “simple” function μ(x) = x∕(1+ x) in Eq. 59View Equation would lead to ∘ -------------------------------------- g = [(gN a0 + gNge − 2gea0 − g2e)+ (2gea0 + ge2− gNa0 − gN ge) +4gN (a0 + ge)3]∕[2(a0 + ge)].