Not to be confused with Friedman's circle theorem.

Circle notation is a way of referring to the function Circle(n) or ⓝ, graphically displayed by n inside a circle, in Steinhaus-Moser Notation.[1] It can also be written Pentagon(n), or, in the Hudelson version, Triangle(n). Circle(n) = Squaren(n) = Square(Square(...(Square(n))...)) (with n squares).

Circle notation growth rate is comperable to \(f_4(n)\) in the fast-growing hierarchy.

Sources Edit

  1. Circle Notation -- from Wolfram MathWorld

See also Edit

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