Do all the exercises below - hand in only the
numbered exercises.
Section 2.2, exercise 3 (note: you don't need to show much)
Section 2.2, exercise 5 [These are extremely routine, but be sure
you can perform these computations easily.]
1. Section 2.2, exercise 6 (for (a), H is
already given as a group, so it's already closed - all you need to
show is containment; a similar comment applies to (b))
2. Section 2.3, exercises 1,4,5
Section 2.3, exercise 10
Section 2.3, exercise 11
Section 2.3, exercise 12
3. Section 2.3, exercise 26
4. Section 2.4, exercises 14,15
Section 2.5, exercise 2
5. Section 2.5, exercise 11 [This is very
easy - use the lattices for the smaller groups.]
read Section 2.5, exercises 12-14
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