Section outline
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Proof of the Seifert-Van Kampen theorem.Polygonal presentations of surfaces. Fundamental groups of surfaces and their abelianizations.Reading: Chapter 6 (pages 159-172). Chapter 10 (pages 264-273).Some recommended
Exercises: 6.11, 10.18, 10.20.
Problems: 6-3, 6-6 (skip question about Euler char.), 10-7, 10-18.