4 ms·

Ha, well then my class/texts have failed to mention these practical uses.

• Retra 10y ago
  Sub-disciplines of mathematics don't blow up and become cornerstones of education if they don't have practical applications. Analysis, Topology, Algebra, Abstract Algebra, Linear Algebra, Statistics, Geometry... If something doesn't have a major practical use, it'll probably be named after somebody specific and studied in relative obscurity.
  • sn9 10y ago
    Number theory was a major field for centuries before people discovered there was a practical use for it.
    • Retra 10y ago
      Number theory has always had practical use. It used to just be called "Arithmetic", and it didn't become something else until that something else had demonstrated practicality.
      • sn9 10y ago
        The sort of number theory that mathematicians studied for centuries had no practical use until the development of cryptography and computing in the latter half of the 20th century. That's why Hardy famously used it as his example of mathematics done with no consideration or hope of there ever being a practical application.
        • Retra 10y ago
          I'm talking about education. Mathematicians work on useless stuff all the time. They don't teach it as part of their core curriculum. Either way, Hardy was wrong. Number theory became relevant because of the work of people who thought it could be. There was hope for a practical application, even if Hardy couldn't see it.
        • lostlogin 10y ago
          > latter half of the 20th century. Nitpick - latter half of the first half.