The logistic map is a simple second-order function on the unit interval: $latex \displaystyle x_{n+1} = r x_n (1-x_n) \,, &fg=000000$ where $latex {x_n}&fg=000000$ is the variable value at stage $latex {n}&fg=000000$ and $latex {r}&fg=000000$ is the ``growth rate''. For $latex {1 \le r \le 4}&fg=000000$, the map sends the unit interval [0,1] into itself. … Continue reading The Logistic Map is hiding in the Mandelbrot Set
Tag: Fractals
Hanoi Graphs and Sierpinski’s Triangle
The Tower of Hanoi is a famous mathematical puzzle. A set of disks of different sizes are stacked like a cone on one of three rods, and the challenge is to move them onto another rod while respecting strict constraints: Only one disk can be moved at a time. No disk can be placed upon … Continue reading Hanoi Graphs and Sierpinski’s Triangle
Fractal Complexity of Finnegans Wake
Tomorrow we celebrate Bloomsday, the day of action in Ulysses. Most of us regard Joyce's singular book as a masterpiece, even if we have not read it. In contrast, Finnegans Wake is considered by some as a work of exceptional genius, by others as impenetrable bafflegab [See TM117 or search for “thatsmaths” at irishtimes.com]. Sentence Length … Continue reading Fractal Complexity of Finnegans Wake
The Power Tower Fractal
We can construct a beautiful fractal set by defining an operation of iterating exponentials and applying it to the numbers in the complex plane. The operation is tetration and the fractal is called the power tower fractal or sometimes the tetration fractal. A detail of the set is shown in the figure here. The Operation … Continue reading The Power Tower Fractal
Santa’s Fractal Journey
The article in this week’s That’s Maths column in the Irish Times ( TM035 ) is about the remarkable Christmas Eve journey of Santa Claus. Dimensions & Fractals How far must Santa travel on Christmas Eve? At a broad scale, he visits all the continents. In more detail he travels to every country. Zooming in, … Continue reading Santa’s Fractal Journey
Ireland’s Fractal Coastline
Reports of the length of Ireland's coastline vary widely. The World Factbook of the Central Intelligence Agency gives a length of 1448 km. The Ordnance Survey of Ireland has a value of 3,171 km (http://www.osi.ie). The World Resources Institute, using data from the United States Defense Mapping Agency, gives 6,347km (see Wikipedia article [3]). Fractals … Continue reading Ireland’s Fractal Coastline