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::<math>x=(x_0,\ldots, x_n)\mapsto \left(\frac{\partial F}{\partial x_0}(x),\ldots, \frac{\partial F}{\partial x_n}(x)\right)</math>
:which lands in the dual projective space.
* The dual variety of a point {{math|(''a''<sub>0</sub>: ..., ''a<sub>n</sub>'')
::<math>a_0x_0+\ldots +a_nx_n=0.</math>
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