n forces and then considered it as non-viscous. If we now introduce the viscosity of the fluid, the equation 1.2 becomes: n 0 for the flow is no more irrotational; and then equation 1.4 also changes for:n - jso the motion of the flow of fig 1 can now be described as:and the whole derivation that led to our paradox is changed.We have here the perfect example that illustrates the fact that starting from wrong hypothesis, we can arrive to absurd results. And this is also true for such brilliant scientist as Mr DAlembert....
