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\leftline{Mathematics 242 -- Principles of Analysis}
\leftline{Definitions Quiz 1 -- February 4, 2011}
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\leftline{Your Name: $\underline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }$}
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A) (10)  What is the definition of the {\it union} of two sets:  $A \cup B$?
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B) (10) What does it mean for a function $f : A \to B$ to be {\it one-to-one}?
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