Edits

Advanced/Definable Sets/parts/0 logic.tex

@@ -60,7 +60,7 @@ The function of these is defined by \textit{truth tables}:
 
 \vspace{2mm}
 
-$A \land B$ is only true if both $A$ and $B$ are true. $A \lor B$ is only true if $A$ or $B$ (or both) are true. \par
+$A \land B$ is only true if both $A$ and $B$ are true. $A \lor B$ is true when $A$ or $B$ (or both) are true. \par
 $\lnot A$ is the opposite of $A$, which is why it looks like a \say{negative} sign. \par
 
 \vspace{2mm}
@@ -92,6 +92,7 @@ Evaluate the following.
 
 \problem{}
 Show that $\lnot (A \rightarrow \lnot B)$ is equivalent to $A \land B$. \par
+That is, show that these give the same result for the same $A$ and $B$.
 \hint{Use a truth table}
 
 \vfill