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Published online by Cambridge University Press: 20 November 2018
The purpose of the present note is to help popularize a section of Artin' s “Geometric Algebra” (chapter 1,4; Interscience, New York (1957) ) by elaborating on its contents. The author will have succeeded when the reader discovers that his results are either presented more simply in Artin' s book or that they are trivial corollaries of its theorems, in particular of theorem 1.11.