In the following case, a region D is defined. Tell whether the region is a domain. If it is a domain, determine whether or not it is simply connected. If it is not a domain, explain why not. The region D consisting of all points (x, y, z) for which 1 < x2 + y2 < 4 (i.e., all points outside a cylinder of radius 1 and within a cylinder of radius 2, both cylinders concentric with the z-axis).

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter9: Surfaces And Solids
Section9.3: Cylinders And Cones
Problem 34E
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In the following case, a region D is defined. Tell whether the region is a domain. If it is a domain, determine whether or not it is simply connected. If it is not a domain, explain why not.

The region D consisting of all points (x, y, z) for which 1 < x2 + y2 < 4 (i.e., all points outside a cylinder of radius 1 and within a cylinder of radius 2, both cylinders concentric with the z-axis).

 

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