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In the emerging field of E-Commerce we show the great potential interest to create 3D virtual shopping centers. The study of a specific application: the creation of an electric household applicants warehouse enables us to highlight the possibilities of the VRML2.0 language to model, visualize and to do interactive walking inside the warehouse. Key features… (More)
Let X and Y be two quaternions over an arbitrary ring. Eight multiplications are necessary and sufficient for computing the product XY. If the ring is assumed to be commu-tative, at least seven multiplications are still necessary and eight are sufficient.