What is meant by a cubic inflection point on a circle map?











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I'm looking at the so-called circle map, defined by the sequence:
$$x_{n+1} = f(x_n) = f^n(x_0) = x_n+Omega - frac{k}{2pi}sin(2pi x_n) quad text{mod }1$$
where $Omega$ and $k$ are some positive parameters. It is stated in this paper http://iopscience.iop.org.ezproxy.lib.ucalgary.ca/article/10.1088/0951-7715/3/3/015/pdf on the universality of irrational windings, that this map has a cubic inflection point. What does this mean?










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    I'm looking at the so-called circle map, defined by the sequence:
    $$x_{n+1} = f(x_n) = f^n(x_0) = x_n+Omega - frac{k}{2pi}sin(2pi x_n) quad text{mod }1$$
    where $Omega$ and $k$ are some positive parameters. It is stated in this paper http://iopscience.iop.org.ezproxy.lib.ucalgary.ca/article/10.1088/0951-7715/3/3/015/pdf on the universality of irrational windings, that this map has a cubic inflection point. What does this mean?










    share|cite|improve this question
























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I'm looking at the so-called circle map, defined by the sequence:
      $$x_{n+1} = f(x_n) = f^n(x_0) = x_n+Omega - frac{k}{2pi}sin(2pi x_n) quad text{mod }1$$
      where $Omega$ and $k$ are some positive parameters. It is stated in this paper http://iopscience.iop.org.ezproxy.lib.ucalgary.ca/article/10.1088/0951-7715/3/3/015/pdf on the universality of irrational windings, that this map has a cubic inflection point. What does this mean?










      share|cite|improve this question













      I'm looking at the so-called circle map, defined by the sequence:
      $$x_{n+1} = f(x_n) = f^n(x_0) = x_n+Omega - frac{k}{2pi}sin(2pi x_n) quad text{mod }1$$
      where $Omega$ and $k$ are some positive parameters. It is stated in this paper http://iopscience.iop.org.ezproxy.lib.ucalgary.ca/article/10.1088/0951-7715/3/3/015/pdf on the universality of irrational windings, that this map has a cubic inflection point. What does this mean?







      sequences-and-series number-theory definition






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      asked Dec 4 at 1:33









      gene

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