We prove a formula for the image of a skew Schur polynomial
$s_{\lambda/\mu}\left( x_{1}, x_{2}, \ldots, x_{N}\right) $ under the
differential operator $\nabla:= \dfrac{\partial}{\partial x_{1}}
+\dfrac{\partial}{\partial x_{2}}+\cdots+\dfrac{\partial}{\partial x_{N}}$.
This generalizes a formula of Weigandt for $\nabla\left( s_{\lambda}\right) $.
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Title
The diagonal derivative of a skew Schur polynomial