Do all the exercises below - hand in only the numbered exercises.
1. Section 3.1, exercise 1
[NOTE: recall that the notation f-1 (A) means the
elements that
map to A under f (the "full pre-image of A") -- even though "f-1"
is
NOT a function in general.]
2. Section 3.1, exercises 6,7,8,9
3. Section 3.1, exercises 4,5
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