Equation Icon  --ℬ2--- --ℬ---- fdffdd = nυℱℱℱddd = 1 + ℬ2 ρfnυκκκ × (vvvNNN − vvvfff) + 1 + ℬ2ρfn υˆκˆκˆκ × κκκ × (vvvccc − vvvfff), (174 )