Parity Ring/Cayley Tables

Cayley Tables for Parity Ring
The parity ring can be described completely by showing its Cayley tables:


 * $\begin{array}{r|rr}

+ & \text{even} & \text{odd} \\ \hline \text{even} & \text{even} & \text{odd} \\ \text{odd} & \text{odd} & \text{even} \\ \end{array} \qquad \begin{array}{r|rr} \times & \text{even} & \text{odd} \\ \hline \text{even} & \text{even} & \text{even} \\ \text{odd} & \text{even} & \text{odd} \\ \end{array}$