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| The article about special relativity as a pdf text can be found here:
specrel.pdf
You may continue with part 2 of the text on special relativity as pdf text here: specrelpart2p.pdf The article about the relativistic Doppler effect as a pdf text can be found here: reldop.pdf Imaging by thin lenses can be understood and summarized by the Cayley cubic in CayleyLens.pdf An octonion is a number consisting of one real part and 7 imaginary parts:
Application of Octonions:
A Roman surface and a T-shape surface as objects of glass:
Two crosscaps relatively rotated by 180°
These 3 non-orientable surfaces can be formed by continuous deformation of a double sphere:
(this animated GIF is from http://www.ipfw.edu/math/Coffman/steinersurface.html If you want to make POV-Ray images yourself you can download the program for free at:
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