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2.2.3 Surfaces with boundary

Examples of surfaces with boundary are a cylinder and a Möbius band. Other examples are the following:

Surfaces with holes

We can obtain a surface with boundary by taking any surface without boundary and punching some holes in it by removing open discs. For example, Figure 19 shows a sphere with 3
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CO 1069-392-116

The National Archives UK posted a photo:

CO 1069-392-116

Location: Trinidad and Tobago




Date: 1870-1939




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