Titlebook: Geschichte studieren; Eine praxisorientier Gabriele Lingelbach,Harriet Rudolph Textbook 2005 VS Verlag f?r Sozialwissenschaften | Springer

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https://doi.org/10.1007/978-3-658-07627-6eometric duality, direct derivatives, Petrie duals, and partial duality. We concluded by defining the ribbon group and describing how twisted duality can be obtained as orbits under the ribbon group action on the set of edge-ordered embedded graphs.