Two curves are said to be orthogonal to each other, when they intersect at right angle at each of their points of intersection.
The analytic function f(z) = u + iv consist of two families of curves u(x,y) = c and _{1}v(x,y) = c which form an orthogonal system._{2}[-(∂u/∂x)/(∂u/∂y)][-(∂v/∂x)/(∂v/∂y)] = [-(∂u/∂x)/(∂u/∂y)][-(-∂u/∂y)/(∂u/∂x)] with the help of C-R equations = -1 |

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