… as the set
\[\begin{equation*} F \supseteq \{0, 1\}, \end{equation*} \]
in conjunction with the addition operation
\[\begin{gather*} \forall a, b \in F, \\[1ex] a + b \in F \end{gather*} \]
and the multiplication operation
\[\begin{gather*} \forall a, b \in F, \\[1ex] ab \in F \end{gather*} \]