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Trigonometry and Double Algebra

work by De Morgan

Learn about this topic in these articles:

discussed in biography

  • De Morgan, Augustus
    In Augustus De Morgan

    In his Trigonometry and Double Algebra (1849) he gave a geometric interpretation of the properties of complex numbers (numbers involving a term with a factor of the square root of minus one) that suggested the idea of quaternions. He made a useful contribution to mathematical symbolism by…

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