本图片使用SageMath创作.

This image is part of an animation created with SageMath. Further information at http://www.nilesjohnson.net/hopf.html "The Python-based mathematics program Sage was used for determining the fiber parametrizations and keeping track of all the animation data. Sage provides an interface to the ray tracing system Tachyon, and this is what produced the individual frames. The music was edited with Audacity. To stitch the frames into an animation, I used FFmpeg, a full-featured program for working with audio and video in a broad range of codecs. The frames for this animation were rendered on the high-powered machines made available by Jonathan Hanke at the University of Georgia, and I'm extremely grateful for this support. Raytracing the final product took 24 modern processors about 40 hours."^[1]

我，本作品著作权人，特此采用以下许可协议发表本作品：

本文件采用知识共享署名 4.0 国际许可协议授权。

您可以自由地：

• 共享 – 复制、发行并传播本作品
• 修改 – 改编作品

惟须遵守下列条件：

• 署名 – 您必须对作品进行署名，提供授权条款的链接，并说明是否对原始内容进行了更改。您可以用任何合理的方式来署名，但不得以任何方式表明许可人认可您或您的使用。

https://creativecommons.org/licenses/by/4.0CC BY 4.0 Creative Commons Attribution 4.0 truetrue

1. ↑ A visualization of the Hopf fibration by Niles Johnson