🚧 Setup for 3.1

chapter_3/test_yourself.md

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+**Test Yourself**
+
+Page 141
+
+1. If $P(x)$ is a predicate with domain $D$, the truth set of $P(x)$ is denoted
+   _______. We read these symbols out loud as _______.
+
+$\{x \in D | P(x)\}$; "the set of all $x$ in $D$ such that $P(x)$."
+
+2. Some ways to express the symbol $\forall$ in words are _______.
+
+for every for all, for any, for each, for arbitrary, given any
+
+3. Some ways to express the symbol $\exists$ in words are _______.
+
+there exists, there exist, there exists at least one, for some, for at least
+one, we can find a
+
+4. A statement of the form $\forall x \in D$, $Q(x)$ is true if, and only if,
+   $Q(x)$ is _______ for _______.
+
+true; every $x$ in $D$.
+
+5. A statement of the form $\exists x \in D$ such that $Q(x)$ is true if, and
+   only if, $Q(x)$ is _______ for _______.
+
+true; at least one $x$ in $D$.