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Jörg Jahnel

  1. When is the (co)sine of a rational angle equal to a rational number?
    2010/06/15 by Jörg Jahnel, Jahnel, Jörg · 2 citations
    Mathematics · Social Sciences · #97G60 #97H20 #FOS: Mathematics #History and Overview (math.HO) #History and Theory of Mathematics #Mathematics Education and Teaching Techniques #Mathematics and Applications