🚧 Setup for 7.1

chapter_7/test_yourself.md

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+**Test Yourself**
+
+1. Given a function $f$ from a set $X$ to a set $Y$, $f(x)$ is _____.
+
+2. Given a function $f$ from a set $X$ to a set $Y$, if $f(x) = y$ then $y$ is
+   called _____ or _____ or _____.
+
+3. Given a function $f$ from a set $X$ to a set $Y$, the range of $f$ (or the
+   image of $X$ under $f$) is _____.
+
+4. Given a function $f$ from a set $X$ to $Y$, if $f(x) = y$ then $x$ is called
+   _____ or _____.
+
+5. Given a function $f$ from a set $X$ to a set $Y$, if $y \in Y$ then
+   $f^{-1}(y) =$ _____ and is called _____.
+
+6. Given functions $f$ and $g$ from a set $X$ to a set $Y$, $f = g$ if, and only
+   if, _____.
+
+7. Given positive real numbers $x$ and $b$ with $b \neq 1$, $\log_b(x) =$ _____.
+
+8. Given a function $f$ from a set $X$ to a set $Y$ and a subset $A$ of $X$,
+   $f(A) =$ _____.
+
+9. Given a function $f$ from a set $X$ to a set $Y$ and a subset $C$ of $Y$,
+   $f^{-1}(C) =$ _____.