On the other hand, simple intuitive explanations may not lead to simple mathematical analyses. Things which are obvious and simple to grasp, may involve near-

On the other hand, simple intuitive explanations may not lead to simple mathematical analyses. Things which are obvious and simple to grasp, may involve near-insoluable systems of equations! This seems to be the case with lifting force. We can easily explain lifting-force if first we get rid of the wingtips. Just explain 2D airfoils in a 2D "flatland world." Infinitely-wide wings are almost trivial to analyze.