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On This Day

  • 5-23-1576

    Tycho Brahe given use of the island of Hven for his astronomical observatory.

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    Tycho Brahe

  • 5-23-1606

    Juan Caramuel y Lobkowitz born in Madrid. His Mathesis biceps of 1670 expounded the general principle of number systems with an arbitrary base b. Caramuel pointed out that some of these systems might be of more use than the decimal system.

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    Juan Caramuel y Lobkowitz

  • 5-23-1857

    Cauchy died near Paris. Famous for his limit definitions of the concepts of calculus, helping to make the subject rigorous, he also worked in a number of areas besides real and complex analysis.

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    Augustin-Louis Cauchy

  • 5-23-1887

    Number theorist and logician Thoralf Skolem born in Norway. He discovered that the real numbers could have countable models, a fact known as Skolem's Paradox.

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    Thoralf Skolem
    Skolem's Paradpx