Added some notations.

src/cat/notation/index.tex

@@ -14,6 +14,8 @@
     $\mathbb{D}_n$, $\mathbb{D}$ & Dyadic rationals of level $n$; all dyadic rationals. & \autoref{definition:dyadic} \\
     $\mathrm{rk}(q)$ & Dyadic rank of $q \in \mathbb{D}$. & \autoref{definition:dyadic-rank} \\
     $M(x)$ & Unique $M(x) \subset \mathbb{N}^+ \cap [1, \mathrm{rk}(x)]$ such that $x = \sum_{n \in M(x)} 2^{-n}$. & \autoref{proposition:dyadic-subset} \\
-    $[n]$ & $\bracs{1, \cdots, n}$ & N/A
+    $[n]$ & $\bracs{1, \cdots, n}$ & N/A \\
+    $R[x]$ & Ring of polynomials over $R$. & N/A \\
+    $F(x)$ & Field of fractions over $F$. & N/A \\ 
 \end{tabular}