Jonathan A Poritz Primary position, course info • CC LA: here. • I am an Associate Professor in the        Department of Mathematics and Physics at        Colorado State University – Pueblo. • From July 2012 to August 2013, I am on sabbatical, so I am not physically on the CSU-P campus much. If you want to get in touch with me, the best way is certainly by e-mail. • Web pages for (some) past courses I have taught are here. Random Useful Information • Current analog contact coordinates are available here. • E-mail: jonathan.poritz@gmail.com (That is my primary, preferred e-mail address. If something seems not to be working with it, however, you can try poritzj@post.harvard.edu or jonathan@poritz.net) Feel free to send me encrypted e-mail, by using my GnuPG key (Fingerprint:7C8B ADBA FE03 3C31 4E52 071D 8488 65F3 7638 565E) • In case you need to be able to recognize me, here is an image. • Here is a CV; and here are some past affiliations. Random Scientific Information • Some of my [p]reprints can be found here. • Follow this link for some interactive mathematics -- using a Java applet to help visualize the geometry of fundamental domains (like the pattern of circles above) for the action of cyclic subgroups of $PSL(2,\CC)$ on the boundary $\partial H^3_\RR$of three-dimensional hyperbolic space. • Many pretty fundamental domains (like the one to the left) in the interior of $H^3_\RR$ for the action just mentioned are shown in a gallery.

An explanation of the background is available for the incurably curious; other pictures on this page are fully explained in my papers -- read them or weep!