The catenoid is a minimal surface, and the surface of rotation of a curve called the catenary. The model shows lines of curvature (parallels and meridians) as well as diagonal asymptotic lines A black ...
This model, the last in the group, shows a catenoid, that is to say a surface of revolution of a catenary. It has a round, flat bottom and a smaller round, flat top with an indentation in between.
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