∑ Xah Lee 李杀 is a user on mstdn.io. You can follow them or interact with them if you have an account anywhere in the fediverse.
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#math of the day. Spherical Cycloid http://VirtualMathMuseum.org/SpaceCurves/spherical_cycloid/spherical_cycloid.html this is what you get when you roll a circle on another circle, on a sphere. #xahmath #geometry
