Avsnittsöversikt
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Left and right cosets. Normal subgroups. Quotient groups. Lagrange's theorem.
Dummit & Foote sections 3.1-3.2
Recommended exercises: Section 3-1, exercises 1, 6, 7, 24, 30, 43(highly recommended)
Section 3-2, exercises 6, 8, 11