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Theorem 1: Seifert - van Kampen (Figure 13.1.1)
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Thereom 2; Seifert - van Kampen proof (Figures 13.1.2, 13.1.3, 13.1.4, 13.1.5, 13.1.6 and 13.1.7)
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Exercise 4 and Exercise 7 (Figures 13.1.8 and 13.1.9)
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