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\leftline{Mathematics 243 -- Algebraic Structures}
\leftline{Definitions Quiz 1 -- September 8, 2006}
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\leftline{Your Name: $\underline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }$}
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A) (5) Let $f : A \to B$ be a mapping.  What is the definition
of the property that $f$ is {\it injective (one-to-one)}.
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B) (5) Let $A = \{-4,-2,0,2,4,6,8\}$ and $B = \{x \in {\bf Z}\ |\ 1 \le x \le 5\}$.
What is the set $A \cap B$?
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