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**Proof: Everywhere Tangent to Curve??**

If the function v depends on x and y, v(x,y) and we know there exists some function psi(x,y) such that

vx = partial w.r.t (y) of psi

vy= -(partial w.r.t (x) of psi)

show that the curves psi(x,y) = constant, are everywhere tangent to v.

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