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Context I would like to compute the torque that a razor thin disc applies onto a razor thin ring. Attempt I have defined a domain dom = ImplicitRegion[0 <= x <= 1 && -1 <= y <= 1, {x, y}]; and the Laplace operator op = -Laplacian[u[x, y], {x, theta, y}, "Cylindrical"]; I impose the edge...