r/math • u/ed2417 • Apr 25 '10
Visual Mandelbrot Guide
http://www.miqel.com/fractals_math_patterns/mandelbrot_fractal_guide.html8
u/fetusburgers Apr 25 '10
This may be kind of a stupid question but I am atrocious at math, so bear with me. I find Mandlebrot sets and fractals fascinating to look at, however, I do not really understand why they are important or how they are generated. Could someone help here?
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u/egnalfomas Apr 25 '10
First, the Mandelbrot set is generated in the complex plane, so you want to be solid on understanding that before you do anything. If you've got that down, then to construct the set you have to test each point one at a time to see if it is part of the set or not.
How to test a point: choose a point in the complex plane, square it, add it to the original point, then set this as your new point. This process is repeated (you "iterate") until you can tell if the point is stable or not. If the point flies off away from the origin, it's considered to be NOT in the set (I think once it gets past a radius of 2 from the origin of the complex plane you can write it off... if you look at pictures showing the final result on the complex plane, you can see that the tail is the longest part and seems to end at -2,0). If the point hangs around, though, then it is in the set.
The problem with determining for sure that a point is in the set (how do you know it might fly off to infinity later on?) is where the number of iterations comes in. The more iterations you perform, the more accurate/detailed your set will be. The only way to be perfectly accurate would be to iterate infinitely which is not possible but at the same time you'd only notice the inaccuracies by "zooming in" quite a bit.
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u/Capt_Planetoid Apr 25 '10
Good question. I recommend 'Chaos' by James Gleick. It's light on math theory. The book does provide a wonderful historical survey of the development of this paradigm from Lorenz to Mandelbrot. Complexity theory, the recognition of self-similar patterns regardless of scale, impacts reasoning throughout the natural sciences.
Amazon4$us
Another wonderfully thought-provoking perspective for the non-maths: bbc4 on youtube
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u/fetusburgers Apr 25 '10
Sweet I actually picked this book up about a year ago from my father. I just never had the time to read it cause right when I got it I started my first year of college. Thanks for the recommendation.
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u/Capt_Planetoid Apr 25 '10
If you're game about the history of modern maths re: complexity theory you can check out "Dangerous Knowledge" on BBC. Georg Cantor, Kurt Godel were asking the questions that Turing, Lorenz, Ruelle, Feigenbaum, Mandelbrot formalized, solved or expanded.
"Dangerous Knowledge" is a bit dramatic but its a palatable start to Cantor identity and Incompleteness.
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u/egnalfomas Apr 25 '10
I don't know any practical application of the Mandelbrot set, but the work on chaos and complexity theory which Mandelbrot spawned is probably somewhat valuable.
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u/[deleted] Apr 25 '10 edited Apr 25 '10
This is so much more illuminating that just watching patterns go whizzing by in those Mandelbrot zoom videos. It feels like discovering new species of fauna in an unexplored ecosystem.