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Deleting a hyperplane from a polar space associated with a symplecticpolarity we get a specific, symplectic, affine polar space. Similar geometry,called an \afsempol\ arises as a result of generalization of the notion of analternating form to a semiform. Some properties of these two geometries aregiven and their automorphism groups are characterized.

Affine polar spaces derived from symplectic spaces, their geometry and representations: alternating semiforms