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\leftline{Mathematics 242 -- Principles of Analysis}
\leftline{Definitions Quiz 1 -- February 1, 2013}
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\leftline{Your Name: $\underline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }$}
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A) (5)  What is the definition of the {\it union} of two sets:  $A \cup B$?
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B) (5) Let $f : \{A,B,C,D,E\} \to \{1,2,3,4\}$ be a function.  Is it possible for
$f$ to be one-to-one?  Why or why not?
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