Column

  1. Math

    Winning at Tennis

    The probability of winning a tennis set or match doesn't depend, in theory, on which player serves first.

    By Ivars Peterson
  2. Math

    Knot an Interchange

    Highway interchanges can get you into knotty situations.

    By Ivars Peterson
  3. Math

    Mean Median Surprise

    Calculations of means and medians lead to surprising sequences of numbers.

    By Ivars Peterson
  4. Math

    Divisibility by Seven

    An ingenious, recently developed method tests if a number is divisible by 7.

    By Ivars Peterson
  5. Math

    Coins in a Row

    A simple game involving coins in a row has unexpected complexities.