Dear all, Next week we have planned a working session introducing the Python module SnapPy, for investigating hyperbolic 3-manifolds. Please install this (free) software on your laptop to participate. Installation instructions follow. 0.) Point your favorite web browser to the following link: https://www.math.uic.edu/t3m/SnapPy/installing.html 1.) Follow the instructions there based on your computer's operating system. You may also want to visit the tutorial page after installation, at https://www.math.uic.edu/t3m/SnapPy/tutorial.html See you next week. Best regards, Robert Haraway