Model in the collection of mathematical models and instruments, Georg-August-Universität Göttingen Göttingen.<br>see also <a rel="nofollow" class="external text" href="http://www.universitaetssammlungen.de/modelle">universitaetssammlungen.de/modelle</a> for more information on the models. In the middle here, a spectrahedron.
Ramona Trusheim
CC BY-SA 3.0
universitaetssammlungen.de