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\leftline{Mathematics 242 -- Principles of Analysis}
\leftline{Definitions Quiz 7 -- April 8, 2011}
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\leftline{Your Name: $\underline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }$}
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A) (10) Let $f$ be defined on an open interval containing $x = c$.
What does it mean to say $f$ is differentiable at $c$?
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B) (10) What does it mean for a set $S \subset {\bf R}$ to be countably 
infinite?
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