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...View metadata citation and similar papers at core ac uk brought to you by provided phydid zeitschriften fu berlin didaktik der physik fruhjahrstagung wuppertal sandwich products reflections martin erik horn hochschule fur wirtschaft und recht school of economics law badensche str fach no d germany bsp business potsdam calandrellistr mail grassmann algebra de martinerikhorn abstract as are an elementary part model construction in physics we really should look for a mathematical picture which allows very general description the product delivers such using language geometric vectors arbitrary dimen sions multivectors i e linear combinations dimensions can be described mathematically astonishingly coherent mathematics there is severe difference between while dealing with if reflect when discussing problems mathe object g arrow shown figure matics plane mirror simple optical situation original always supposed have same dis tance from yet lying on different sides thus consider two r kinds in...