1993 | OriginalPaper | Buchkapitel
The Fifth Week: Fundamental Groups
verfasst von : Michio Kuga
Erschienen in: Galois’ Dream: Group Theory and Differential Equations
Verlag: Birkhäuser Boston
Enthalten in: Professional Book Archive
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Last week we were considering curves in a region. A region was a part of the plane surrounded by closed curves (for example, the unshaded part of figure 5.1). We decided to call such a region land and the outside region a sea or a lake (such as the shaded part of Figure 5.1) Figure 5.1