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

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

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

Created by

Linas Vepstas
Alternative names	L. Vepstas
Description	technologist, entrepreneur, researcher, programmer and computer scientist GnuCash maintainer for over 7 years.
Authority file	: Q61131517 VIAF: 311397845 ORCID: 0000-0002-2557-740X

on 14 February 2005 using custom software written entirely by Linas Vepstas.

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

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