L = ∮ p n ⋅ k d S , displaystyle L=oint pmathbf n cdot mathbf k ;mathrm d S, Because the velocity is deduced within the vorticity in these kinds of theories, some authors describe the problem to imply the vorticity is the cause of the velocity perturbations, working https://raymondnvcip.signalwiki.com/1298823/5_essential_elements_for_lift