# Talk:Mandelbrot set

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Mandelbrot set was a good articles nominee, but did not meet the good article criteria at the time. There may be suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.
Article milestones
DateProcessResult
March 9, 2007Good article nomineeNot listed

## Ellipse's

Every time I post this kind of stuff somebody comes in and deletes it. So, I'll leave this here for you folks and let you decide.

Ellipse Positive Set, x^2+x*y+y^2=1, <(1/3)*sqrt(3)*cos(ϑ)-sin(ϑ), (1/3)*sqrt(3)*cos(ϑ)+sin(ϑ)>: z^1 = <x+x_0, y+y_0> z^2 = <x^2-y^2+x_0, y*(y+2*x)+y_0> z^3 = <x^3-3*x*y^2-y^3+x_0, 3*x*y*(x+y)+y_0> z^4 = <x^4-6*x^2*y^2-4*x*y^3+x_0, 4*x^3*y+6*x^2*y^2-y^4+y_0>

Ellipse Negative Set, x^2-x*y+y^2=1, <cos(t)-(1/3)*sqrt(3)*sin(ϑ), cos(ϑ)+(1/3)*sqrt(3)*sin(ϑ)>: z^1 = <x+x_0, y+y_0> z^2 = <x^2-y^2+x_0, y*(-y+2*x)+y_0> z^3 = <x^3-3*x*y^2+y^3+x_0, 3*x*y*(x-y)+y_0> z^4 = <x^4-6*x^2*y^2+4*x*y^3+x_0, 4*x^3*y-6*x^2*y^2+y^4+y_0> Example of z^2 from negative set. https://www.khanacademy.org/computer-programming/z2-ellipse-normalized/6285584115646464 Left click zooms in, right click zooms out.

Mixed Circle and Ellipse sets mixed. <x^2-y^2+x0^3-3*x0*y0^2+y0^3, 2*x*y+y_0+3*x0*y0*(x0-y0)> Here is an example of a mixed set: https://www.khanacademy.org/computer-programming/cn2e03-magnitude/5661509447008256 Changed the distance function to an area function, x0*y1+x1*y0. This is the area between the vector <x0, y0> and the vector <x1, y1>. If I need to explain this further, lemme know.

This one, it was an accident. But give it a chance. Zoom in a bit. If you can find it off to the center left, there is a set of lungs beside the heart. https://www.khanacademy.org/computer-programming/cn2ie32-magnitude/5411191639457792

X-Rated <(x0+x1+y0+y1)*(x0+x1-y0-y1)+x0, (2*(y1+y0))*(x1+x0)+y0> https://www.khanacademy.org/computer-programming/x-rated-mandelbrot/5791655344685056 — Preceding unsigned comment added by Tejolson (talkcontribs) 13:16, 24 November 2020 (UTC)

(z^2)^2 Mandelbrot: <(x0^3-3*x0*y0^2+x1^3-3*x1*y1^2)^2-(3*x0^2*y0+3*x1^2*y1-y0^3-y1^3)^2, (2*(3*x0^2*y0+3*x1^2*y1-y0^3-y1^3))*(x0^3-3*x0*y0^2+x1^3-3*x1*y1^2)> https://www.khanacademy.org/computer-programming/cn3c32-magnitude-color-mix-variation/5412316920889344 Oh, that's not a (z^2)^2 Mandelbrot? I must have forgotten something... <(x0^3-3*x0*y0^2+x1^3-3*x1*y1^2)^2-(3*x0^2*y0+3*x1^2*y1-y0^3-y1^3)^2, (2*(3*x0^2*y0+3*x1^2*y1-y0^3-y1^3))*(x0^3-3*x0*y0^2+x1^3-3*x1*y1^2)> https://www.khanacademy.org/computer-programming/c_n3ic32c-magnitude-color-mix-variation/5092117646622720 Crap, it's a star for some reason. Almost a star fish quality to it. It's suppose to be the original z^2 Mandelbrot Set. Oh, and I used a mixed color variation. It's bed time. I gotta go hunting in 3 hours. — Preceding unsigned comment added by Tejolson (talkcontribs) 08:03, 24 November 2020 (UTC)

## First appearance of Mandelbrot set?

The Mandelbrot set was used as a decorative motif for a kind of space portal in Episode 11 of Space 1999. The episode was broadcast in 1975: https://editorial01.shutterstock.com/wm-preview-1500/813719gk/4fbb5a0c/gtv-archive-shutterstock-editorial-813719gk.jpg

## Proposal for subsection of Generalization

Dear community. I fully understand that Wikipedia is not the place to promote one’s own work. I therefore open this discussion here instead of editing the page. I recently published a peer-reviewed scientific article in the journal Chaos. (Chimeras confined by fractal boundaries in the complex plane, Chaos 31, 053104 (2021)). In this article I study the fractal sets generated by a network of four coupled quadratic maps. Below I summarize the main findings and provide references. In my view, this could be considered as a generalization of the Mandelbrot set to four coupled maps. It might therefore fit into the section 'Generalization'. Looking forward to hearing your opinions.

In a nutshell: In analogy to the dichotomous behavior of individual quadratic maps, the states of networks of coupled identical quadratic maps either remain bounded or diverge to infinity. Beyond that, the bounded states can further be sub-classified with regard to their synchronization. In my article, I study the case of a minimal two-population network of two pairs of each two quadratic maps. In this case, one can find full desynchronization of all four maps, full synchronization of all four maps, or different states of partial synchronization. Among the states of partial synchronization are so-called chimera states, for which one pair of maps synchronizes and the maps of the other pair remains desynchronized. In these images (iterative zoom, details of one zoom step), gray colors are used for complex c at which the network states diverge, where lighter gray indicates slower divergence. Different non-gray colors indicate the different states of synchronization. The resulting fractal patterns seem in general less filigree, more disordered but also fuller of variety than the Mandelbrot set.

References: The printed article at the journal page can be found here (open access only until 17th of May). The reprint of the article at the homepage of my university can be found here (identical content and open access). The source code used to run my simulations is provided here.

--Cyclingralph (talk) 20:56, 6 May 2021 (UTC)

## The problematic description

You see, nearly every other mathematical wikipage has a good text description. This one, however, has an equation in it.

This is really uncanny and should be removed.

- TomEpsilon (edits) (email) 06:09, 3 February 2022 (UTC)

The Issue is that the set is formed/defined by an equation so it's pretty hard to write a description that does not include the equation itself. I do think that some of the more technical language should be removed to make it more understandable to readers (such as changing "remains bounded" to "does not escape to infinity")
- Roboprince (talk) 10:21, 9 November 2022 (UTC)

The article contains this sentence:

"The Mandelbrot set can also be defined as the connectedness locus of the family of quadratic polynomials, while its boundary can be defined as the bifurcation locus of this quadratic family."

If you are unable or unwilling to write in much clearer language than that, then I really hope you wait until you do before posting again. 2601:200:C000:1A0:C8A4:CA26:62BA:98A2 (talk) 00:33, 17 November 2022 (UTC)

If you are unwilling to tolerate even a brief mention of more-advanced mathematics concepts in your reading, with appropriate links where you can find out more about those concepts if you have any curiosity about what they might mean, then reading about mathematics on Wikipedia may not be for you. We cannot lobotomize our content to the point where even mathematics-averse and mathematically illiterate readers will find nothing to challenge them. That would make the articles uninformative for the rest of their readers. —David Eppstein (talk) 00:37, 17 November 2022 (UTC)
There is nothing whatsoever wrong with mentioning advanced or even very advanced mathematical concepts.
But if you use advanced language when simpler language is readily available and comprehensible to a much wider swath of people, then you show that you don't understand the purpose of an encyclopedia. 2601:200:C000:1A0:C8A4:CA26:62BA:98A2 (talk) 00:45, 17 November 2022 (UTC)
Though I disagree with the way the criticism was made, this definition as well as the two locus definitions it linked to had issues as written which may have contributed to an impression of word salad. I made minor edits to all three pages to attempt to address those issues. Sue Don M (talk) 05:00, 1 January 2023 (UTC)

## Any Good?

I made this website dedicated to the mandelbrot set (and Julia set). (it takes a sec to load) But is it something worth including on the wiki page?

Peter-3113 (talk) 14:47, 28 November 2022 (UTC)

Hi Peter. At the least it needs a much better explanation of what is going on. What are we looking at? What do mouse movements do? What are the sliders on the top? What do the function entries do? I'm thinking the mouse generates a complex constant that is then added to the function and then iterated. Is that right? Need an explanation at the high school math level.--agr (talk) 15:02, 28 November 2022 (UTC)
Thanks for the feedback.
Are you suggesting adding this exlpanation on my web site itself, or having it around/before the linked is pressed.
Just wanted to clarify.
But I do agree, it could be clearer. (Although there is a brief description if you press ' i ' ). Peter-3113 (talk) 19:04, 28 November 2022 (UTC)