Such as, even though it can be done to assemble a circle from one line interval by overlapping and "gluing" the ends, this does not deliver a chart; a portion of the circle will likely be mapped to each finishes simultaneously, losing invertibility. Sphere[edit] 2nd countable and Hausdorff are position-established http://valves-and-fittings08417.arwebo.com/12134550/manifold-valve-for-dummies