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Discrete Math
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OpenStudy (anonymous):
Suppose A = {3n | n E Z} and f: R --> R is defined by f(x) = X a(x). That is f is the characteristic function of set A. a) what is f({2n | n E Z})? b) what is f^-1({2n | n E Z})?
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OpenStudy (paxpolaris):
Sorry. don't know what a characteristic function is .. :(
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