File:Discriminant real part.jpeg

Discriminant_real_part.jpeg(600 × 600 pixels, file size: 66 KB, MIME type: image/jpeg)

Summary

originally uploaded to en:wiki, with this history:

• 04:11, 15 February 2005 . . Linas (Talk | contribs) . . 600×600 (67,813 bytes) (Modular discrimnant, real part, as function of nome.)

Modular discriminant, real part, as function of nome. (600x600 pixels)

Detailed description

This image shows the real part of the modular discriminant ${\displaystyle \Delta =g_{2}^{3}-27g_{3}^{2}=(2\pi )^{12}\eta ^{24}}$ as a function of the square of the nome ${\displaystyle q=\exp(i\pi \tau )}$ on the unit disk |q| < 1. That is, ${\displaystyle \pi \tau }$ runs from 0 to ${\displaystyle 2\pi }$ along the edge of the disk. Black areas indicate regions where the real part is zero or negative; blue/green areas where the value is small and positive, yellow/red where it is large and positive. The fractal self-similarity of this function is that of the modular group; note that this function is a modular form. Every modular function will have this general kind of self-similarity.

In the above, g2=60 G4 and g3=140 G6 are Weierstrass elliptic functions invarients, whereas ${\displaystyle \eta }$ is the Dedekind eta function.

See also Image:Gee_three_real.jpeg and Image:Gee_three_imag.jpeg for the real and imaginary parts of g3.

The imaginary part is quite similar. It, and other related images, can be seen at http://www.linas.org/art-gallery/numberetic/numberetic.html

Source of Image

Created by Linas Vepstas User:Linas <linas@linas.org> on 14 February 2005 using custom software written entirely by Linas Vepstas.

Released under the Gnu Free Documentation License (GFDL) by Linas Vepstas.

Licensing

 Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. Subject to disclaimers.

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Date/TimeThumbnailDimensionsUserComment
current20:54, 21 September 2006600 × 600 (66 KB)Ylebruoriginally uploaded to en:wiki, with this history: * 04:11, 15 February 2005 . . Linas (Talk | contribs) . . 600×600 (67,813 bytes) (Modular discrimnant, real part, as function of nome.) Comments made by the author follow. [[Weierstrass elliptic funct
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