# How do you describe a fractal mathematically?

**About fractals and math art**

The math background

**Quote: "Benoit Mandelbrot 1975 - The fractal geometry of nature" (according to MathePrisma):**

*Clouds are not spheres, mountains are not cones, coastlines are not circles. The bark is not smooth - and lightning does not make its way straight either ...**The existence of such forms challenges us to study what Euclid leaves aside as formless, leads us to the morphology of the amorphous. So far, however, mathematicians have avoided this challenge. By developing theories that are no longer related to visible things, they have moved away from nature. In response to this, we will develop a new geometry of nature and demonstrate its usefulness in various fields. This new geometry describes many of the irregular and fragmented shapes around us - with a family of figures we will call fractals.*

Everything you need to know about theory and still have fun with MathePrisma at the Bergische Universität Wuppertal.

Fractal Type: IFS Fern, found on James Henstridge's Java Fractals

Fractals and the game of chaoshttp://www.MathePrisma.uni-wuppertal.de/Module/Fraktal/index.htm

An introduction to the variety and mathematical backgrounds of fractals that is easy to follow.

Self-similarity, feedback, iterated function systems (IFS), affine mapping, geometric

Iteration, order in chaos, ornaments and fractals, lots of Java applets to try out.

**Fractals for viewing on the internet**

Very nicely designed gallery with stunning pictures: ´**You have to call that.****The HOP Gallery**http://www.mpeters.de/mpeweb/hop/gallery/gallery.htm

A menu in HOP's Gallery

There are **Competitions** (Contests) **for fractal art**.

**"Bistred Mandorla", Artist: Tina Oloyede**http://www.contest2k.com/en/entry-050-6.htm

**LOOK AT!**

If you want to search for fractals on the web yourself, you can start here:

Spanky's Fractal Database "What's new?"http://spanky.triumf.ca/www/whats-new.html

Interactive fractals on the Internet

On z., B. On the following pages you will find Java applets to play with fractals and create your own pictures

**Mandelbrot Set, Julia Set, Fractal Planet Generator, Java Applet **http://www.ehynan.com/java_applet/fractal_applet/FractApplet/

I created the following with the planet generator there:

Planets and clouds created with the Fractal Planet Generator

A compilation and overview of different types of fractals: **Java fractals by James Henstridge**http://daa.com.au/~james/fractals/

Classic fractals that can be zoomed in any depth **Fractal map**http://frac.samurajdata.se

Mandelbrot Volcano, multiple zoom, found on Fractal-Map

Mandelbrot Blues, multiple zoom, found on Fractal-Map

My software favorites

Here are some software links. I tried the following programs and with them the

most of the images created here on the site. There are a lot more offers if you are looking for it then

check out The Spanky Fractal Database New Fractal Programs or Specific Fractal Programs at Other Sites.

A search on cnet also brings plenty of results.

I've only considered programs that run on Windows NT4.0 or 2000.

The software is freeware or shareware. You can find the details on the respective download page.

**Ultra Fractal, shareware software**http://www.ultrafractal.com

Most extensive formula library, i.e. an extremely large number of different basic patterns. Can use layers, color gradients.

Anyone who knows Java can write their own IFS functions and classes and thus expand the formula library.

Julia, made with Ultra Fractal

Two layers Julia, made with Ultra-Fractal

**Fractal eXtreme**http://www.cygnus-software.com/index.html

Various basic objects. Can zoom movie and iteration movie. Interesting color selection dialogs (gradient)

Barnsley, made with Fractal eXtreme

Barnsley, made with Fractal eXtreme

Two of the Cubic Newton type created with Fractal eXtreme

**Aros Fractals for Windows95 and Windows NT**http://www.arosmagic.com

Only 3 types of images. In addition to Mandelbrot and Newton, beautiful textures are also possible

Two of the type Plasma Cloud created with Aros Fractals

**Paul de Leeuw's Manp-Win for Win32 (nice!) **Download http://athena.atr.net/manpwn32.zip

Diverse, brings some more basic types and design ideas, but no preview when selecting and changing parameters.

You just have to click a lot: Color dialog on - change something - press ok - see result.

With this program the picture is created at the top of the page (pair with circles).

Fractal-Type: Martin, made with manpwin

Finally

I am fascinated by the possibilities these programs offer. In a short time I have created the best pictures.

Here are a few more. I've lost track of what is done with which program.

A great peculiarity of the fractal images is that you can zoom in - without end. The small picture is an enlargement of one of the small black dots in the first picture.

Have fun discovering yourself! Martin Wohlgemuth for Matroids Matheplanet 8.4.2001.

Update of the external links on July 20th, 2002

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