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Dot Product in Four-Space

By this time, everyone is familiar with the dot product. If, not, return to the three-dimensional case and add a fourth coordinate where appropriate. The Pythagorean Theorem extends very nicely to the fourth and all higher dimensions!

Mathematics Awareness Month is sponsored each year by the Joint Policy Board for Mathematics to recognize the importance of mathematics through written materials and an accompanying poster that highlight mathematical developments and applications in a particular area.